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<p>Dense fog in multiple places has highly impacted the regular operations of flights, resulting in delays and cancellations of flights over the past few days. </p>
<p>Passengers travelling to and from cities such as Hyderabad, Varanasi, Udaipur, Jammu, Vizag, and Jaisalmer have experiences slow lifting of aircrafts caused by low visibility.</p>
<p>Even though some flights were able to stick to their schedules, others had to be postponed or called off while the authorities and the airlines were figuring out a safer approch to handle the situation.</p>
<p>However, the fog did not completely take over the airspace, and the flight operations at Indira Gandhi International (IGI) Airport in Delhi were generally uninterrupted.</p>
<p>The status report of the airport indicated that CAT I operations were in progress, visibility was about 1,300 meters, and no flight diversions were happening at 7:30 a.m. Travelers are recommended to check their status regularly as situations might change due to the weather.</p>
<h2><strong>Airlines issue travel advisories for passengers</strong></h2>
<p>To keep all the passengers updated with the schedule, multiple airlines have given out advisories regarding travel. For instance, IndiGo announced that the low visibility conditions at Hyderabad and Guwahati might result in changes in the flight schedules. The travelers were informed to check their flight status accordingly through the airline's website and were provided with other alternatives such as rescheduling of flight or refund for flights affected. </p>
<blockquote><p dir="ltr" lang="en" xml:lang="en">Travel Advisory</p>
<p>Visibility at <a href="https://twitter.com/hashtag/Hyderabad?src=hash&amp;ref_src=twsrc%5Etfw">#Hyderabad</a> remains low, and several flights are now operating with revised timings.</p>
<p>Some flights may experience delays, and cancellations remain a possibility as the weather shows no signs of improvement. We encourage you to monitor your flight…</p>
<p>— IndiGo (@IndiGo6E) <a href="https://twitter.com/IndiGo6E/status/2006938523618914703?ref_src=twsrc%5Etfw">January 2, 2026</a></p></blockquote>
<script async="" src="https://platform.twitter.com/widgets.js" charset="utf-8"></script><p>Likewise, SpiceJet provided information regarding the delays and interruptions in Varanasi, Patna, and Hyderabad, along with their advice to travelers to check online for their flight status. Airlines have assured that their personnel are on duty throughout the day and night to work on reducing the waiting time and providing support to the passengers at the terminals.</p>
<blockquote><p dir="ltr" lang="en" xml:lang="en"><a href="https://twitter.com/hashtag/WeatherUpdate?src=hash&amp;ref_src=twsrc%5Etfw">#WeatherUpdate</a>: Due to bad weather in Patna (PAT) and Hyderabad (HYD), all departures/arrivals and their consequential flights may be affected. Passengers are requested to keep a check on their flight status via <a href="https://t.co/2wynECZugy">https://t.co/2wynECZugy</a>.</p>
<p>— SpiceJet (@flyspicejet) <a href="https://twitter.com/flyspicejet/status/2006920669339288031?ref_src=twsrc%5Etfw">January 2, 2026</a></p></blockquote>
<script async="" src="https://platform.twitter.com/widgets.js" charset="utf-8"></script><script async="" src="https://platform.twitter.com/widgets.js" charset="utf-8"></script><p>Travelers are advised to keep themselves updated constantly, factor in extra time for their travels, and get updates before going to the airport.</p>
<p>Weather conditions are being constantly monitored and collaboration with local agencies is in place, thus the airlines are planning to support their smoother operations as soon as the fog disappears. The travelers are also notified to obey the rules given by the airlines and wait as safety is still the main concern during these weather interruptions.</p>
<h2><strong>Instrument Landing System (ILS) Categories</strong></h2>
<ul>
<li><strong>CAT I (Category I)</strong></li>
</ul>
<ol>
<li>Decision Height (DH): Not less than 200 ft (60 m)</li>
<li>Runway Visual Range (RVR): Minimum of 550 m (1800 ft) or visibility of 800 m</li>
<li>Equipment: Standard ILS, usually manual landing after DH</li>
<li>Appropriate for normal weather phenomena at the majority of airports</li>
</ol>
<p><strong>Read more:<a href="https://www.zeebiz.com/india/news-delhi-air-quality-improves-slightly-despite-falling-temperatures-387030"> Delhi air quality improves slightly despite falling temperatures </a></strong></p>
<ul>
<li>
<p><strong>CAT II (Category II)</strong></p>
</li>
</ul>
<ol>
<li>DH: Below 200 ft but no less than 100 ft (30 m)</li>
<li>RVR: Minimum of 300–350 m (1000–1200 ft)</li>
<li>Equipment: Enhanced ILS, autopilot or HUD required, specialized pilot training</li>
<li>Can manage moderate fog and low visibility</li>
</ol>
<ul>
<li><strong>CAT III (Category III) – Split into levels</strong></li>
</ul>
<ol>
<li>III A: DH less than 100 ft or nil; RVR ≥ 200 m (700 ft)</li>
<li>III B: DH less than 50 ft or none; RVR 50–200 m (150–700 ft)</li>
<li>III C: No DH or RVR restriction; allows landing in almost zero visibility</li>
<li>Equipment: Autoland systems, better lighting, and extensive pilot training</li>
</ol>
<h2><strong>Why it matters? </strong></h2>
<ul>
<li>Safety: Reduce chances of accidents during bad weather; stops diversions in case of bad weather</li>
<li>Efficiency: Assure that airports can work during fog or low clouds</li>
<li>Certification: CAT II/III operations require certified aircraft, airports, and trained pilots</li>
</ul>


Dense fog in multiple places has highly impacted the regular operations of flights, resulting in delays and cancellations of flights over the past few days. Passengers travelling to and from cities such as Hyderabad, Varanasi, Udaipur, Jammu, Vizag, and Jaisalmer have experiences slow lifting of aircrafts caused by low visibility.Even though some flights were able to stick to their schedules, others had to be postponed or called off while the authorities and the airlines were figuring out a safer approch to handle the situation.However, the fog did not completely take over the airspace, and the flight operations at Indira Gandhi International (IGI) Airport in Delhi were generally uninterrupted.The status report of the airport indicated that CAT I operations were in progress, visibility was about 1,300 meters, and no flight diversions were happening at 7:30 a.m. Travelers are recommended to check their status regularly as situations might change due to the weather.Airlines issue travel advisories for passengersTo keep all the passengers updated with the schedule, multiple airlines have given out advisories regarding travel. For instance, IndiGo announced that the low visibility conditions at Hyderabad and Guwahati might result in changes in the flight schedules. The travelers were informed to check their flight status accordingly through the airline's website and were provided with other alternatives such as rescheduling of flight or refund for flights affected. Travel AdvisoryVisibility at #Hyderabad remains low, and several flights are now operating with revised timings.Some flights may experience delays, and cancellations remain a possibility as the weather shows no signs of improvement. We encourage you to monitor your flight…— IndiGo (@IndiGo6E) January 2, 2026Likewise, SpiceJet provided information regarding the delays and interruptions in Varanasi, Patna, and Hyderabad, along with their advice to travelers to check online for their flight status. Airlines have assured that their personnel are on duty throughout the day and night to work on reducing the waiting time and providing support to the passengers at the terminals.#WeatherUpdate: Due to bad weather in Patna (PAT) and Hyderabad (HYD), all departures/arrivals and their consequential flights may be affected. Passengers are requested to keep a check on their flight status via https://t.co/2wynECZugy.— SpiceJet (@flyspicejet) January 2, 2026Travelers are advised to keep themselves updated constantly, factor in extra time for their travels, and get updates before going to the airport.Weather conditions are being constantly monitored and collaboration with local agencies is in place, thus the airlines are planning to support their smoother operations as soon as the fog disappears. The travelers are also notified to obey the rules given by the airlines and wait as safety is still the main concern during these weather interruptions.Instrument Landing System (ILS) CategoriesCAT I (Category I)Decision Height (DH): Not less than 200 ft (60 m)Runway Visual Range (RVR): Minimum of 550 m (1800 ft) or visibility of 800 mEquipment: Standard ILS, usually manual landing after DHAppropriate for normal weather phenomena at the majority of airportsRead more: Delhi air quality improves slightly despite falling temperatures CAT II (Category II)DH: Below 200 ft but no less than 100 ft (30 m)RVR: Minimum of 300–350 m (1000–1200 ft)Equipment: Enhanced ILS, autopilot or HUD required, specialized pilot trainingCan manage moderate fog and low visibilityCAT III (Category III) – Split into levelsIII A: DH less than 100 ft or nil; RVR ≥ 200 m (700 ft)III B: DH less than 50 ft or none; RVR 50–200 m (150–700 ft)III C: No DH or RVR restriction; allows landing in almost zero visibilityEquipment: Autoland systems, better lighting, and extensive pilot trainingWhy it matters? Safety: Reduce chances of accidents during bad weather; stops diversions in case of bad weatherEfficiency: Assure that airports can work during fog or low cloudsCertification: CAT II/III operations require certified aircraft, airports, and trained pilots

Passengers travelling to and from cities such as Hyderabad, Varanasi, Udaipur, Jammu, Vizag, and Jaisalmer have experiences slow lifting of aircrafts caused by low visibility.

Flight Safety in Fog: CAT operations and travel advisories for passengers

Dense fog in multiple places has highly impacted the regular operations of flights, resulting in delays and cancellations of flights over the past few days.  Passengers travelling to and from cities such as Hyderabad, Varanasi, Udaipur, Jammu, Vizag, and Jaisalmer have experiences slow lifting of aircrafts caused by low visibility. Even though some flights were able to stick to their schedules, others had to be postponed or called off while the authorities and the airlines were figuring out a safer approch to handle the situation. However, the fog did not completely take over the airspace, and the flight operations at Indira Gandhi International (IGI) Airport in Delhi were generally uninterrupted. The status report of the airport indicated that CAT I operations were in progress, visibility was about 1,300 meters, and no flight diversions were happening at 7:30 a.m. Travelers are recommended to check their status regularly as situations might change due to the weather. Airlines issue travel advisories for passengers To keep all the passengers updated with the schedule, multiple airlines have given out advisories regarding travel. For instance, IndiGo announced that the low visibility conditions at Hyderabad and Guwahati might result in changes in the flight schedules. The travelers were informed to check their flight status accordingly through the airlines website and were provided with other alternatives such as rescheduling of flight or refund for flights affected.  Travel Advisory Visibility at #Hyderabad remains low, and several flights are now operating with revised timings. Some flights may experience delays, and cancellations remain a possibility as the weather shows no signs of improvement. We encourage you to monitor your flight… — IndiGo (@IndiGo6E) January 2, 2026 Likewise, SpiceJet provided information regarding the delays and interruptions in Varanasi, Patna, and Hyderabad, along with their advice to travelers to check online for their flight status. Airlines have assured that their personnel are on duty throughout the day and night to work on reducing the waiting time and providing support to the passengers at the terminals. #WeatherUpdate: Due to bad weather in Patna (PAT) and Hyderabad (HYD), all departures/arrivals and their consequential flights may be affected. Passengers are requested to keep a check on their flight status via https://t.co/2wynECZugy. — SpiceJet (@flyspicejet) January 2, 2026 Travelers are advised to keep themselves updated constantly, factor in extra time for their travels, and get updates before going to the airport. Weather conditions are being constantly monitored and collaboration with local agencies is in place, thus the airlines are planning to support their smoother operations as soon as the fog disappears. The travelers are also notified to obey the rules given by the airlines and wait as safety is still the main concern during these weather interruptions. Instrument Landing System (ILS) Categories CAT I (Category I) Decision Height (DH): Not less than 200 ft (60 m) Runway Visual Range (RVR): Minimum of 550 m (1800 ft) or visibility of 800 m Equipment: Standard ILS, usually manual landing after DH Appropriate for normal weather phenomena at the majority of airports Read more: Delhi air quality improves slightly despite falling temperatures  CAT II (Category II) DH: Below 200 ft but no less than 100 ft (30 m) RVR: Minimum of 300–350 m (1000–1200 ft) Equipment: Enhanced ILS, autopilot or HUD required, specialized pilot training Can manage moderate fog and low visibility CAT III (Category III) – Split into levels III A: DH less than 100 ft or nil; RVR ≥ 200 m (700 ft) III B: DH less than 50 ft or none; RVR 50–200 m (150–700 ft) III C: No DH or RVR restriction; allows landing in almost zero visibility Equipment: Autoland systems, better lighting, and extensive pilot training Why it matters?  Safety: Reduce chances of accidents during bad weather; stops diversions in case of bad weather Efficiency: Assure that airports can work during fog or low clouds Certification: CAT II/III operations require certified aircraft, airports, and trained pilots

Passengers travelling to and from cities such as Hyderabad, Varanasi, Udaipur, Jammu, Vizag, and Jaisalmer have experiences slow lifting of aircrafts caused by low visibility.