The head of the Federal Aviation Administration said on Wednesday that he expects the Boeing 737 MAX ​7 to be certified this summer and the larger MAX 10 to be ‌approved before the end of the year.

Boeing is preparing to seek approval from the Federal Aviation Administration (FAA) to increase production of its top-selling 737 Max jets to 42 units per month later this year, CEO Kelly Ortberg announced on Wednesday.

Boeing has restarted production of its best-selling 737 MAX jetliner, marking a crucial step in the company’s recovery after a seven-week strike by 33,000 factory workers.