The computer software that crashed and grounded Comair's entire fleet on Christmas Day was an antiquated system due to be replaced in the coming months. […]

The SBS Crew Check system tracks all the details of where each crew member is scheduled and keeps a log of every scheduling change. Tom Carter, a computer consultant with Clover Link Systems of Los Angeles, said the application has a hard limit of 32,000 changes in a single month.

This probably seemed like plenty to the designers, but when the storms hit last week, they caused many, many crew reassignments, and the value of 32,000 was exceeded, he said.

The Cincinnati Post F-Secure/NFTL