Delhi is the second Indian destination after Bengaluru.
After Singapore Airlines and Emirates, German carrier Lufthansa on Saturday launched daily services of its super jumbo Airbus A-380s between Delhi and Frankfurt.
India is the first Asian country where Lufthansa will deploy its latest fleet member the B747-800.
Air India resumed normal services on sectors like Delhi-London-Delhi, Delhi-Frankfurt-Delhi, Mumbai-London -Mumbai, Delhi-New York-Delhi, Mumbai-New York-Mumbai, Mumbai-Chicago-Mumbai, Amritsar-London-Toronto-London-Amritsar and Ahmedabad-Mumbai-Newark-Mumbai on Thursday.
A security drill on Sunday created a major scare and sent Air India and security officials into a tizzy after a grenade-like object was found on a Boeing 747 aircraft when it landed at Jeddah in the wee hours.
In a security scare, a dummy stun-grenade was on Saturday found on board an Air India jumbo plane as it landed at Jeddah in the wee hours, which the airline attempted to downplay but was rebuffed by Civil Aviation Minister Ashok Gajapathi Raju who called it a "failure".