I guess R is a valid fare code for super saver fares -
Mileage Calculator - Royal Jordanian (rj.com) - the fare just doesn't show up or earn anything on the US-based oneworld airlines AA and AS.
- Super Saver Economy “R” class tickets are not eligible for award miles accrual, nor eligible for upgrade to Crown Class using miles.
- Super Saver Economy “R” class tickets are eligible for 25% tier miles accrual and half-segment count.
- Economy class tickets purchased on “G” Class (Group Fare) are not eligible for award or tier miles accrual, nor eligible for upgrade to Crown Class using miles.