Boeing’s latest setback with production issues means airlines will have fewer planes than they expected to handle big crowds of travellers this summer. CEO David Calhoun said that delivery delays will remove about 9,000 seats from airline schedules this summer.

The CEO didn’t give the number of planes used in that calculation, but the number of seats typically in a mid-sized Max suggests that about 50 planes are expected to be delivered late.

During Boeing’s annual shareholder meeting Calhoun said that inspections and repairs related to unapproved fuselage parts will prevent the company from delivering dozens of 737 Max jetliners to airlines in time for the summer season. But it won’t affect plans to increase the production rate for the best-selling plane, he said.

The situation is reminiscent of last year, when production flaws stopped Boeing from delivering bigger 787 planes, and airlines dropped some flights and routes.