Pratt & Whitney recommended checks on engines on Airbus A220 aircraft and some Embraer jets after a Geneva-bound Swiss jet diverted to Paris with an engine problem, prompting the grounding of the rest of the airline's A220 fleet.

French air accident investigators classified the problem that disrupted the Swiss flight shortly after departure from London Heathrow as a "serious incident" and said it would be investigated by the U.S. National Transportation Safety Board.

Swiss, owned by Germany's Lufthansa, said it had grounded its fleet of 29 Airbus A220 jets for a review of their engines.