Airlines resumed flights as per schedule from Sunday morning. "Our team from Kanpur airport reached Lucknow's Chaudhary Charan Singh International Airport at 11 pm on Saturday. Since Kanpur airport is not used much, they took the data card from there and installed it in Lucknow VOR, making it operational just after midnight. The notice to airmen (Notam) issued earlier in the day about closure of Lucknow airport was lifted and airlines resumed operations from Sunday morning," said a senior AAI official.The AAI is now studying how this problem can be avoided in future. "This data card is the same for both the original and the backup VOR.

Source: Times of India January 15, 2017 05:47 UTC