Air Berlin will cease all long-haul flights by Oct. 15.

The move comes as leasing companies repossess Air Berlin's widebody fleet of Airbus A330 aircraft while the carrier goes through the European equivalent of bankruptcy proceedings.

Air Berlin discontinued six U.S. routes Monday: Dusseldorf-Los Angeles, Dusseldorf-Boston, Dusseldorf-Orlando, Berlin-Chicago, Berlin-Los Angeles and Berlin-San Francisco.

Travelers who booked flights directly with Air Berlin and did so after the carrier filed for insolvency on Aug. 15 will receive refunds. Those who booked before then won't get refunds because those assets are held up in court proceedings.

Air Berlin also flies from Dusseldorf to New York, San Francisco, Miami and Fort Myers, Fla., and from Berlin to New York and Miami. Those flights will take off for the last time by Oct. 15.

Lufthansa and EasyJet are the leading bidders for portions of Air Berlin's assets.

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