Ok so wanted to get some advice and if this is even possible...
Looking at a trip later in Aug through JFK to AUA (so domestic to intl). Would arrive 1030pm and depart following morning at 745am, so about 9hrs. Am looking at booking a minute suite in T4 for overnight and shower in the sc in the morning, so don't want to have to leave airside especially as I'm not sure how late ticketing is open on a Thurs night.

It appears that DL will thru-check my bag since its under 12hrs. Is this true? Any experiences with long/overnight thru-check at JFK? Also any info on how late ticketing is actually open in case I have to get my bag and then drop it off at say 1130pm?

Site note of annoyance - DL won't let me book this as cash, and even if I try multi-city it only gives me the first morning flight to jfk and not the night that I want... but if I use miles no problem.