The irate passengers staged a protest at the Air India counter at Delhi airport on Sunday.
The flight, slated at 2.20 PM, left around midnight last night after the aircraft was made available and a fresh set of cockpit and cabin crew mobilised to replace the earlier ones whose flight duty time limitation (FDTL) had expired, an Air India official said.
Air India has 10 Dreamliner planes and one of these operates on Delhi-Kolkata route. But currently, the airline has only eight aircraft at its disposal as two planes are in Mumbai for upgrade of software and hardware, after a series of problems dogged them.
"We had to find replacement crew and the flight was further delayed and took off around midnight," the official said.
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Airport sources said the exasperated passengers, many of whom were in transit and had landed from London, gheraoed the airline counter demanding explanation.
The passengers were first told the aircraft would depart by 5.30 PM but it was delayed further and finally left around 11.30 PM.
Some of the passengers, especially those in transit, were sent to Kolkata by an evening flight, he said.