We have tickets to travel from NY to MCO on 9/14. My sister now wants to join us. For some reason the flights are really expensive on 9/14 and 9/15 but the weeks before and after are priced excellent. I checked our flights and there are still MANY seats available. Why would one week be so much more then the next or previous. Is something going on in FL, where they think many people might need flights??? I thought this was strange.