Jet-engine durability issues and the lack of spare parts are saddling the aviation industry. 
Few industries do well when their products are forever being returned for early repairs. Jet-engine makers are currently an exception—and this is raising eyebrows.

Shares in RTX Corporation hit a record high last week after the aerospace conglomerate significantly beat second-quarter earnings forecasts. Excluding one-time effects, operating profit in its Pratt & Whitney engine-making division rose 23%. GE Aerospace also reported a surge in demand for spare parts for commercial engines, and its stock closed at a 16-year high last Tuesday. In Europe, jet-engine manufacturers Rolls-Royce and Safran are expected to post robust results when they report this week.

Excerpt from WSJ
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