You missed some of the JetBlue postings they were back in early Feb. They are making their decisions now as I've had a couple of calls about the few I applied for.
Also with the tourism background you have I'm not sure what kind of position airlines would like to have you in. In postings I see it tends to be a background in Aviation, Business, so something technology related.
Basically if you put tons of time into it things will go your way. Think out of the box. Start calling each airline's(or other companies) HQ
and ask for the HR
department then keep working the chain of commands and don't take no for an answer. If they don't offer something ask if they'd be willing to consider something on a volunteer basis. Be creative!
Also I know it isn't in NYC but USAir tends to post their stuff in late April.(For Washington DC) I was lucky enough to work with their systems forecasting department for a summer.