ATHENS (AFP) - Greece scrambled fighter jets to monitor a US passenger plane that failed to identify itself when entering Greek airspace this week, an official said on Saturday, confirming media reports.

The Delta Air Lines aircraft, flying from Paris to Kuwait, entered the Athens Flight Information Region(FIR) at 7.10pm on Thursday (1.10am on Friday, Singapore time), the same day the EgyptAir plane crashed in the Mediterranean shortly after leaving Greek airspace.

Its pilots failed to answer to repeated calls from the Greek Civil Aviation authorities, according to various media reports, confirmed to AFP by a Greek defence ministry source.

Following military protocol, at 7.49pm (1.49am Singapore time) two F-16 fighter jets intercepted the Delta plane while it was flying near the Aegean island of Santorini.

According to the Mega Channel, one of the fighter jets flew in front of the passenger plane and with light signals alerted the pilots to switch on their radio on the right frequency.

The Ant1 Channel said that the pilots contacted Greek authorities at 7.55pm (1.55am Singapore time) and exited the Athens FIR at 8.10pm (2.10am Singapore time).

The incident occurred after the EgyptAir Airbus A320 carrying 66 people from Paris to Cairo disappeared off radar screens in the early hours of Thursday, without its crew sending a distress signal.

There was no suggestion of a link between the EgyptAir crash and the Delta incident.