(Huffington Post) United Airlines cut the grounded Boeing 787 from its flying plans at least until June and postponed its new Denver-to-Tokyo flights on Thursday, as airlines continued to tear up their schedules while the plane is out of service.

Investigators are still trying to figure out what caused a battery fire in one plane and forced the emergency landing of another plane last month. The world’s 50 787s have been grounded since Jan. 16.

United spokeswoman Christen David said the plane could still fly earlier than June 5 if a fix is found. At that point it would be used as needed around United’s system, she said.

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