United Airlines is 'deeply disappointed' in Boeing over delays to new plane deliveries, as another major customer warns it needs to get its 'act together'

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United Airlines Boeing 737 MAX 9 passenger aircraft as seen taxiing at Chicago International Airport O'Hare ORD preparing for a departure flight
A United Boeing 737 Max 9.

Nicolas Economou/NurPhoto via Getty Images

The FAA has given Boeing the green light to start certification test flights of its long-awaited 737 MAX 10

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Boeing 737 MAX 10.
The FAA has cleared Boeing to start certification test flights of its 737 MAX 10, which is expects to enter service in 2024.

Taylor Rains/Insider

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