Southwest on Wednesday trimmed its revenue outlook for the first quarter by $150 million following the recent grounding of its Boeing 737 Max jets.

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Shares of Southwest, the largest operator of the 737 Max 8 jets, fell on the revised forecast.

Ticker Security Last Change %Chg
LUV SOUTHWEST AIRLINES CO. 48.75 +0.06 +0.12%

Now, Southwest expects its operating revenue per available seat mile — an airline’s passenger-carrying capacity — to increase in the 2 to 3 percent range, compared with its previous guidance of 3 to 4 percent, according to federal filings.

Boeing operates 34 Boeing 737 Max 8 jets. It was the first North American flight operator to receive a 737 Max 8 delivery.

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