I just noticed that the JFK-SNN flight is on a 757. I don't like travelling on long flights in economy on 757.
As for alcohol, beer and wine are complimentary on international flights but mixed drinks cost. That's how it was in Dec when I travelled from ATL to LHR in economy on Delta. I was even obliged with an extra meal upon asking. I was starving as I had been running all day due to numerous reroutings that day ( I had arrived at the aireport at 6:30 a.m. ) and boarded that flight at 10:30 p.m.).