Just had a connection through IAH out of AUS on a cheap ticket. No problem getting the upgrade out of Houston on the long segment, but missed an upgrade out of Austin by a mile. There must have been a lot of high-level elites (can't wait until 1k starts trumping ordinary Plats!) and I didn't much care on such a short flight. What surprised me was that the cabin had only 1 F seat remaining with maybe 40 on the standby list, yet I was offered an upgrade for just $49. Didn't take it myself, but was left wondering how many of the 16 seats were sold at that price.