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'

• United Airlines' CFO said the airline is "deeply disappointed" in Boeing due to delays, per Reuters.
• It is reportedly looking to buy more Airbus jets due to delays for the 737 Max 10.
• Ryanair's CEO also said Boeing's management "doesn't appear to have a grip on the situation."

Airlines are getting frustrated with Boeing due to delivery delays.

United Airlines is "deeply disappointed" in Boeing, its chief financial officer, Mike Leskinen, said during a Tuesday conference, Reuters reported.