United Airlines Holdings Inc. flight attendants rejected a new contract that would have provided cumulative pay increases of as much as 45.6% over five years.

The flight attendants union said it would survey members on what issues they would like to see resolved in a new contract.

An undisclosed “technology issue” delayed more than 1,000 United Airlines flights across the U.S. United Airlines said in a statement Wednesday that flights on major routes were held at their departur