Besides, another 15 aircraft of the company are also aground due to want of spares, and the airline is now left with only 15 planes to carry out its operations, they said.
"Lessors have taken back as many as 34 aircraft from Kingfisher between March and June, owing to non-payment of lease rentals, which stand at around Rs 1,000 crore," sources told PTI.
The airline, however, said it has returned these aircraft voluntarily and that no aircraft was taken back by lessors by "force".
"There has been no forced return of the aircraft to the lessors. Whenever we have returned planes, we have voluntarily done so," a Kingfisher spokesperson said in a text message.
It has also grounded another 15 planes as they require spares but due to paucity of funds it has not been able to replace them, sources said.
"The airline currently has just 15 aircraft worth flying and a majority of them are ATRs," they said. According to the sources, the 15 aircraft in service include eight ATRs, one A319, four A320s and two A321s.
The airline today operates only around 100 odd flights with these aircraft, and has withdrawn from international operations.
The liquor baron Vijay Mallya-promoted airline, which is sitting on a debt pile of over Rs 7,500 crore, had reported a loss of 1151.5 crore for the quarter ending March.
The cash-strapped airline, which has not reported profit since launch, has not been able pay salaries since February nor it has managed to pay its dues to oil companies and airports. It has also defaulted on payment of service tax and TDS to the government.