My fiancee and I showed up to JFK in T1 for an AeroMexico flight about 4-5 hours early for the same reason; to experience the lounges etc...AeroMexico had issued an online boarding pass to which was promptly denied by TSA/Airport Security. They didn't even scan the BP, all they kept saying was AeroMexico does not allow mobile tickets, Airport Security kept telling me i needed a paper pass. Of course AeroMexico has no agents until an hour before scheduled departure...I kept thinking to myself "then why the $@$% would they issue a mobile boarding pass".

FYI - There is an internet cafe in the T1 arrivals area, by baggage claim, that charges a ridiculous about to print. (cost me 8 dollars to print two boarding passes ($6 for 30 mins time even though I used computer for 1 minute and $2 for print)). I figured it was worth it just so I could get in the lounge, after I presented the printed passes they scanned and we got through.

We enjoyed the Air France lounge very much!