Join Date: Feb 1999
Location: San Jose, California, USA
Programs: AS Plat, UA MM, AA MM, IC Plat, Marriott Gold, Hilton Gold, Hyatt Globalist
Posts: 3,167
Easy answer for me: I carry printouts of all my confirmations all the time.
I need to show my printed confirmations less than 5 percent of the time, but I can never predict which 5 percent, so everything gets printed. I'm definitely in the "better safe than sorry" camp.