Frontier completed the migration last month to a J2EE environment with Solaris on Sun Microsystems Inc. servers that use Advanced Micro Devices Inc. Opteron processors. The new system can handle 500,000 transactions an hour; the older one could handle about a tenth of that, said Rapp.

One of the reasons for Frontier's switch is to improve its ability to work with the Unix-based booking engine of its reservation systems provider, Sabre Holdings Corp. in Southlake, Texas. Frontier began using Sabre just over a year ago, said Rapp, and "we felt that if there were any technical issues we could step through those issues more coherently with them with this particular technology platform."

According to Lexington, Mass.-based Gomez Inc., which benchmarks Web sites, in its most recent survey period, from May 20 to June 20, Frontier scored above the airline industry benchmark average with a 4.13 second response time. The average is 5.596 seconds. One of the fastest-loading Web sites is run by U.S. carrier AirTran Airways Inc. in Orlando, with a 1-second response time, according to Gomez.

AirTran experienced problems this week when an upgrade of its internal reservation systems left travelers waiting in line. The planned shutdown began at 10 p.m. Monday and was scheduled to be completed by 4:30 a.m. Tuesday. But the upgrade did not go as planned, affecting operations throughout the day. By 7:30 p.m. Tuesday, the airline said its "internal reservations and airport check-in systems were online and stabilized."