The Federal Aviation Administration has proposed fining airline company United Continental  (UAL) - Get Report $435,000 for operating flights in 2014 using Boeing (BA) - Get Report 787 aircraft that the government deemed were not airworthy, Reuters reports.

The FAA alleges that in that year United mechanics replaced a fuel pump pressure switch on the aircraft but didn't perform a required inspection before the planes were sent back into service.

"The safety of our customers and employees is our top priority. We immediately took action after identifying the issue and are working closely with the FAA in their review," a United spokesperson told Reuters.

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