Southwest Airlines (NYSE: LUV) is famously a one-airplane airline -- a strategic choice that dovetails with the company's focus on efficiency and keeping things simple. But that one airplane, the Boeing 737, is currently caught in turbulence, and it's impacting Southwest's plans for growth.

Shares of Southwest lost 14.8% in March, according to data provided by S&P Global Market Intelligence, after the company warned Wall Street that it was adjusting guidance downward due to uncertainty about new plane deliveries.

The 737 MAX has turned into a nightmare not just for Boeing but for its customers as well. The plane was grounded for 18 months beginning in 2019 after a pair of fatal crashes, and even after it was returned to service, a series of design and manufacturing issues stalled production.

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Source Fool.com