Well Disney released their UK offers for 2014 today so we are all booked up

Our dates our July 4th to July 17th and we are staying BC GV, with free
DDP and a $200 Disney gift card.
Originally we had hoped to be staying CL but the prices for next year have really risen - for a family of four the cost has increased by about $750 (£500) for a GV room and that's staying 13 nights instead of 14, on top of that my husbands DNeice is coming with us also, the cost to upgrade to CL was about $2600 (£1800) on top of that so I couldn't justify paying that as well.
We are actually leaving Ireland on June 29th, flying to New York to meet my BIL and his daughter (they live in Geneva), staying there for 5 days, and then flying down to Orlando for the stay at the BC with my husbands niece, before flying back to Ireland almost 3 weeks later
Can anyone give me recommendations for an airline to fly from New York to Orlando with? We are flying into from Dublin into JFK and from MCO to Dublin to just need a one way flight from New York (any airport) to MCO. We would prefer one that includes at least one checked bag each and allows us to book seats together.
Thanks for any information