Originally Posted by
corporate-wage-slave
Unfortunately you won't be able to check in the bag at T7 in this situation either, not the day before travel. AA's rules are relatively well known - if rather different to BA's approach - and I'm not surprised they declined to through check. Given you'd still have to lug them over to T7 you may as well go straight to the hotel with them.
If you are staying in town rather than at a JFK fleapit, this is the difference between being forced to take a car and deal with the traffic or taking the airtrain/subway, which can be much quicker.