United Airlines flights on major routes were grounded Wednesday because of a technology issue, and additional flight delays were expected into the evening, the airline said.

An alert on the Federal Aviation Administration website said all United flights destined for Chicago were halted at their departing airports. The agency said Denver, Newark, Houston and San Francisco airports were also impacted by halted flights.

“Safety is our top priority, and we’ll work with our customers to get them to their destinations,” an emailed statement from the Chicago based-airline said without disclosing the specifics of the problem.

An AP journalist had boarded a United plane at the Louis Armstrong New Orleans International Airport for a trip to Houston when flight attendants announced a “systemwide

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