NEWARK, NJ (AP) – Continental Airlines canceled 24 flights Wednesday, most of them out of Newark Liberty International Airport, due to “crew availability” problems.

Continental operates a large hub out of Newark and has about 3,000 daily flights system-wide. It was working to get customers on alternate flights.

READ MORE: Man Allegedly Armed With Taser, Large Knife Arrested At Washington Square Park

Airline spokeswoman Megan McCarthy said that the cancellations were “due to lack of crew availability” but declined to elaborate. Air Line Pilots Association spokeswoman Amy Flanagan declined to comment.

United Airlines bought Continental last year and has been trying to combine them into a single airline. The process has been slower than expected, partly because of contentious labor negotiations.

READ MORE: Police Seek Person Of Interest After Children Are Caught In Middle Of Brazen Shooting In The Bronx

Jeff Smisek, the CEO of United Continental Holdings Inc., said last week that it was unlikely the company could agree to labor contracts with all its unions this year.

The company said it has more pilots this summer than last summer. Company spokeswoman Julie King said the Air Line Pilots Association, which represents pilots at both airlines, “participates in our monthly review to set staffing levels.”

MORE NEWS: Juneteenth Celebrations Across New York City Take On New Meaning In 2021

(Copyright 2011 by The Associated Press.  All Rights Reserved.)