United Airlines still leaving passengers on hold

United Airlines passengers are having difficulty getting a reservations agent on the phone and experiencing other glitches, more than three weeks after a computer switchover was supposed to make things better.

There were widespread reports of passengers waiting on hold to fix ticketing problems. Many reported that they couldn't get through at all. Odd balances were showing up in frequent flier accounts.

United's website says it has "extraordinarily high call volumes" at its call centers, and that some hold times are more than an hour.

The airline says it has solved most of the frequent flier problems, and that it is working to reduce hold times.

The problems began March 3 with a big computer switch that was part of the airline's merger with Continental.