More flights are scheduled in the U.S. than air traffic control can handle, say authorities

The U.S. aviation system is expected to “remain challenged this summer and beyond,” and its federal regulator needs more air traffic control staff, a senior United Airlines executive said on Wednesday, echoing problems in Canada and Europe.

Travellers are already facing a tough summer with mounting flight cancellations amid rising demand as the industry tries to rebuild staff levels after thousands of workers left during the COVID-19…