What both the original HP/US and CO/UA share from their past experience was displaying an arrogance that it was their way or the highway.
It's hard *not* to learn from that type mistake, especially when it results in bad press.
A little trip down memory lane on the last merger of the computer system
http://www.airlineforums.com/topic/34214-cwaibt-letter-to-doug/
Letter to Doug Parker from Larry Cohen and James P.Hoffa
March 12, 2007
CWA
As you are well aware, this switchover – along with the malfunctioning kiosks -- caused an enormous amount of turmoil at airports across the system and particularly along the East Coast. This resulted in agents, who take pride in their professionalism and their ability to serve US Airways customers, being unable to do so, and in many cases, being blamed by local managers for the meltdown.
http://atwonline.com/it-distribution/article/us-airways-bigger-cutover-problem-was-complexity-closing-flights-0309
Kirby told analysts at the JPMorgan Aviation and Transportation Conference that "we had made it needlessly complex to close a flight," a process that involves tallying passengers and bags and collecting other data before an aircraft can push back from the gate.
That compounded the problems that resulted from differences in the way the merged carriers' systems had handled changes in electronic tickets.
http://usatoday30.usatoday.com/travel/flights/2007-03-05-us-airways-monday-update_N.htm
When the new system started over the weekend, it failed to communicate with ticketing kiosks at airports. That forced all passengers to check in at airport counters, creating massive lines. On a normal day, 40% of passengers would use kiosks to check in, Kirby said.
Some passengers on Monday still faced lengthy waits: 90 minutes in Philadelphia, and 45 minutes in Charlotte, for example.
http://www.zdnet.com/blog/btl/us-airways-reservation-system-glitch-strands-passengers/4593
When the kiosk crashed customers had to wait hours in some cases to talk to ticket agents. US Airways had
talked up its integration savvy when it was wooing Delta late last year. Delta shot down US Airways' acquisition attempt.