well actually, my suspicion was right, only full economy earn 100%, the earnings are:

First F A 150%
Business C J Z I P 125%
Full Economy Y M T U N L 100%
Discount Economy Q S 50%
No Mileage Credit R D K H V O W G B X E 0%

OP, you need to find out what class your flight mapped into on Jet from the United