I'm starting this thread as a companion to
The "game" pre Flyertalk
Following are my favorites:
1. Valuemags ---> Concorde
2. Dollar coins
-I even bought a minivan to support this venture
3. Thank You Points for redemptions like ACY-YEG
(this provided around $5,000 in DL credit)
4. Budget car rentals at locations with dirt cheap weekend rates
5. Mistake fares
-these typically lasted for around 7 days during the early years