Boeing was generating optimism. Then on Thursday a 787 crashed, raising the specter of fresh problems for Boeing and altering the message it planned to send.

The event, which runs from June 16 to June 20, is the industry's largest trade show, where many aircraft orders are typically placed by airlines.

(Reuters) -Boeing and GE Aerospace are scaling back their public activities following the fatal crash of an Air India jetliner, with the planemaker's CEO canceling his trip to the Paris Airshow next week and GE postponing an investor day.