Iberia placed #1 with an 83% success rate booking TA online award bookings. AA is the top US airline with 58% success. USAirways falls at the bottom well below CO, UA and DL at a meager 4%.
http://www.ideaworkscompany.com/press/2009...ewardReport.pdf
Actually, I find US, NW and AA to have the highest sucess for using miles. CO and UA are the very bottom. UA has StarNet filtering which makes Star Alliance redemptions hell. Furthemore, their silly rule when redeeming miles for premium classes to Asia, you are only allowed to fly in Business/First across the Pacific leg to the partner hub. Then you must take Coach to your final destination even if J/F is available to other airlines. Ridiculous! There's also the fact that on certain routes, UA doesn't let you redeem your miles on a partner carrier if they fly the route themselves (LAX-LHR is an example of this, no redemptions on NZ flts for UA members.)
US is by far the most tolerant when it comes to using miles. Much better availability than UA and AC and also requires less miles then UA and LH on the same routes. One example:
This summer I'm doing a LAX to MRU (Mauritius, Mauritius- Africa) trip using miles in First. US will do any routing that is available at your choice (like a proper airline does) so I'm flying LAX-FRA-MUC-ZRH-JNB-MRU-JNB-FRA-ZRH-JFK-LAX on Lufthansa, Swiss, South African Airways and United in a mixture of First/Business. The award cost me 150,000 US miles.
If I wanted to do the same thing with UA miles, I couldn't. UA has ridiculous rules about so many miles you can fly to your destination. That means the whole connection via Europe is out. UA would force me to fly to JFK or IAD and fly SA directly to to JNB and on to MRU. Even on the days that LH/LX was available via Europe, but SA wasn't available, they would say, sorry nothing available on SA! When I pointed out that there was availability via Europe on LH/LX United would say that they need me to fly directly and it's not available directly so it's not available at all! They "need" me to fly? What kind of response is that. Obviously not a real airline FFP response!
One last thing to add: even if I was able to book the award to MRU, UA would charge me 160K miles which is more than US and from what I read online, UA is thinking of increasing its award levels yet again!
What else I wanted to say? People who complain about the minimum US Airways $1400 coach fare requirement for upgrading to Envoy are not thinking clearly. Not only is this the most customer friendly INTL travel upgrade policy of ALL the carriers our there, but it's quite a steal in the summertime. The fact that the the fare req of $1400+ includes taxes and is not just based on US segments is fantastic. Many summer fares to Europe to smaller cities w/ less flts easily reach and pass that amount. US doesn't care what airlines are included in the mix or the final destination so I could be flying to Asia or the Middle East and I still get the upgrade on the US flts, because my fares was $1400+.
Compare that to DL, CO or UA that require you to purchase most expensive Economy fares so you can upgrade.
I would not read that report even if I was stuck sitting in a penalty box for 9 hours, let alone pay $2500 CA$H! HA!
-Kinglobjaw