I have a question regarding date changes on an award ticket. I plan on booking a ticket that is within twenty-one days which means I would be charged $75 since I'm a non-elite. The routing I'm looking at is SFO-JFK in F which shows an empty cabin. I really don't want to pay the $75 so if I book a ticket that is for travel in early February, I can request a change of date for free if the origin and destination is the same correct? Thanks!