Boeing orders tumbled in April and were outnumbered by canceled sales in another sign of the crisis gripping the troubled aircraft manufacturer.

Boeing said Tuesday that it received orders for seven planes last month, an unusually small number. That wasn’t enough to offset canceled sales covering 33 planes, 29 of which were related to the shutdown of Lynx Air, a Canadian discount airline that stopped flying in late February.

As expected, deliveries of new Boeing jetliners were weak, at 24 in April, pushing the U.S. company farther behind Airbus, its European rival.

Through the first four months of the year, Airbus has delivered 203 commercial planes, compared with 107 for Boeing. Deliveries are an important source of cash for the companies.

The Federal Aviation Administration is limiting production of new Boeing 737 Max jets while the company tries to improve its manufacturing quality.