But optimism in a resurgent US domestic travel market is offset by growing concerns over COVID variants in India and elsewhere, clouding the industry's recovery.
Boeing shares fell 2.9% to $235.31, compared to a fractionally lower Dow Jones Industrial Average.
The Boeing 737 MAX was grounded globally in March 2019 after two deadly crashes. The source said Turkish Airline's first flight is planned between Istanbul and the capital Ankara on April 12.
Separately, Boeing Co has asked 16 of its customers to address a potential electrical problem in certain 737 MAX airplanes prior to further operations.
Miami-based 777 Partners, which has a stake in Canadian ultra-low-cost carrier Flair Airlines, said it plans to lease the 737-8s to its affiliated carriers.
The deal is expected to boost Boeing's position and provide the much-needed support towards a financial recovery after two fatal 737 MAX crashes triggered a 20-month safety ban on the jet.
The US business, known as GE Capital Aviation Services or GECAS, is one of the world's biggest jet-leasing companies. It leases passenger aircraft made by companies including Boeing Co and Airbus SE.
No further statements will be made by the issuers or the company regarding this matter until the time of the conclusion of those discussions.
The first Loyal Wingman is being used as a foundation for Boeing's Airpower Teaming System, a service being developed for various global defence customers.
CAE, which produces flight simulators for planemakers Boeing Co and Airbus, however, expects to see an uptick in training contracts as more people get vaccinated and resume air travel.
The world's largest civil aviation training specialist said its net income attributable to shareholders fell to C$48.8 million ($38.29 million).