A GoAir plane taxis past a control tower at Indira Gandhi International Airport in New Delhi on September 10, 2018. (Photo: AFP)

NEW DELHI, Jan. 27 (Xinhua) -- India's air traffic regulator on Friday imposed a monetary fine of 1 million Indian Rupees (about 12,252 U.S. dollars) on the private airline "Go First" for leaving 55 passengers behind.

According to the Directorate General of Civil Aviation (DGCA), there were around 180 seats in the aircraft, which took off with around 125 passengers onboard, leaving behind 55 passengers who were inside a bus that was ferrying them from the airport terminal to the aircraft's ladders.

The incident took place at the Bengaluru airport in the southern state of Karnataka on Jan. 9, when the Bengaluru-Delhi flight G8-116 took off leaving behind the passengers. A day later the DGCA issued a notice to the airline.

The airlines regulator found the private airline, or formerly known as GoAir, guilty of not complying with the rules and regulations of air transport services.

Meanwhile, the airline apologised in a statement, saying the incident was caused due to an "inadvertent oversight".

"Passengers were accommodated on alternate airlines to Delhi and onward to other destinations," the statement said, and the airline also announced a free ticket for every affected passenger.