The accidents were attributed to flaws in automated flight software called MCAS, which prompted the planes to nosedive.
The latest incident happened on Friday.
In a statement, Air Canada said the pilots “received an engine notification and, according to the standard operating procedure for such a situation, they decided to shut down an engine” before rerouting to Tucson, Arizona.
The aircraft, with no passengers on board, was being flown from a storage site. It remains on the ground in Tucson.
In the wake of the two crashes, Boeing implemented a series of modifications including updating flight control software, revising crew procedures and rerouting internal wiring.
The aircraft resumed passenger flights, in Brazil, less than three weeks ago.