They always say same day upgrades aren't available @ airport until 2 hours prior to departure. However, in reality, if you show up early, esp. to the P-Club, they will upgrade you anyway. What happens with the E-Service machine? If I use the machine in Penn Station 4 hours prior to departure, will it give me an upgrade if seats are available? Or, will it not upgrade me because I am before the 2 hour window?