^^ I used to get latitude east west flight passes which were a dream for upgrades and points.
Anyway, you used to be able to see how many business class seats were available on a flight and could time it be more likely to get an upgrade. Dunno if that matter anymore.
Stay away from times/legs where business people might fly. Obviously there's a trade off there. Check the same flights say 2 weeks out and 1 week out and see if some fill up more than others.
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