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SJT flights will book into Y class (assuming AA3000-AA3599 series) so that's -20 x 2.
AeAgle flights are AA3000-AA5599 series - no F or J and DONEx's book into Y class.
For most other flight segments with no F or J class (cabin or availability), you get booked into L when on a DONEx. Thre is also a LAN application of Y - it's new; I'll look it up.
BOOKING CODES
FIRST BUSINESS ECONOMY
AA BA CX JL JO KA QF A D L
AY IB MA RJ XL 4M D D L
LA LP A D/W L
LA (IPC–SCL) D D L
AY LA LP XL 4M Domestic Y Y L
[B]AA Flights 3000-5599 Y Y L[/B]
JL Domestic to/from NRT J J H
JL/NU/JC Domestic Flights
(other than to/from NRT)F J Y