Southwest Airlines says it's fixed the technology problems that delayed hundreds of flights Sunday and that it expects a normal day of operations.
The Dallas company had been warning passengers flying Monday to arrive at the airport two hours early and print boarding passes beforehand. When asked early whether fliers should continue with those precautions, an airline spokesman said customers should expect a normal day Monday.
Southwest used backup systems around the country on Sunday to check-in travelers lacking printed or mobile boarding passes.
Airline representatives have not said what was causing the problem, but a spokesman has said there was no indication that hackers were behind it.
There were about 450 delays out of 3,600 flights scheduled Sunday.