Just an odd observation (maybe add to the Wiki, but not sure if it's relevant there):
Last night purchased (2) 500 mile upgrade stickers.
Checked my account this morning, shows I have 2 on file.
Purchased 4 more this morning. 4 hours later, still only shows 2 on file. (yes, the website says *at least 2 hours* for processing).
Anyway, the "oddity"
If I try to use the aa.com iOS app, it will not let me check in unless I purchase 4 upgrades (currently 1 upgrade confirmed other two are "requested" theoretical total would be 6 stickers I need).
If I use the online website, then it happily lets me check-in and wait-lists me for the other 2 segments.
Not sure if this is WAD, but if it is, perhaps this info is useful in the Wiki? (can't check-in online with the app unless your account shows X amount of sticker upgrades, but the website will let you)?