I'm looking to book a EWR-SIN mileage run on UA. Since I don't (yet) have any SWU's, I'll be doing this in Economy. However, since I am a basic Premier, I should be eligible for E+ seating on those a/c that have it. I'll be on a 757 or 320 between EWR and SFO - no problem there.
Question is: how can I improve the odds of getting one of the UA 744s that have been converted to E+ on the SFO-NRT and NRT-SIN segments? I've been told that united.com isn't a reliable source. I've also heard that there are something like 13 744s that haven't been converted - these are the a/c I'm trying to avoid. Are there certain flights that consistently fly the converted a/c? (I know that anything can happen with equipement at the last minute, I'm really just interested in increasing the odds in my favor)
Any help will be greatly appreciated.