I have an upcoming roundtrip CLE-EWR. I need to change my return from Monday to Sunday but they want a $200.00 change fee. If I cancel the return and just book a one-way using FF miles, do I loose my miles on the outbound. On CO it used to be you could cancel the return and have up to one year to reschedule and then pay the change fee. I could do that and just never do the the change. Other option would be do a SDC for $75.00 but seats may not be available and I want to firm my flight now.