Southwest Airlines Boeing 737 Max aircraft are parked on the tarmac after being grounded, at the Southern California Logistics Airport in Victorville, Calif., on March 28. Boeing said its financial outlook is uncertain as it deals with the 737 Max grounding.

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Southwest Airlines Boeing 737 Max aircraft are parked on the tarmac after being grounded, at the Southern California Logistics Airport in Victorville, Calif., on March 28. Boeing said its financial outlook is uncertain as it deals with the 737 Max grounding.