Originally Posted by
MaxFlyer
As you’re arriving at 6:30pm I think a hotel is worth it despite the early start. However, if you stay at the TWA hotel you may want to check the operating times of the Airtrain.
If you can then you could stay in the AA lounge until it closes and then camp out in the lounge until the morning.
Arriving from LHR without a boarding pass departing that day they won't have access to airside at T8 until the next morning.