At 01.30 AM a threat call was received at the Delhi Airport's call centre in Gurgaon.
The caller claimed that there were bombs on three international flights - 9W078 of Jet Airways to Hong Kong, CX694 of Cathay Pacific also bound for Hong Kong and LX147 of Swiss Air to Zurich which later turned out to be hoax, airport sources said.
However, by that time, Jet Airways and Cathay Pacific flights had already left while Swiss flight was preparing for departure, they said.
A thorough search of the aircraft, passengers and their baggage was carried out by the security agencies and later all the three flights were cleared for take-off by them, sources said, adding that emergency was called off at 2:40 AM.
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Sources said that some Air India flights from Delhi airport were delayed due to bomb threat call last evening.
"Call was made to Air India control room at 9 PM yesterday. Though the threat was non-specific, as a precaution some flights were checked. The caller has been traced," sources said.
Services at Delhi airport are normal and all flights are landing and departing on time, they said.