Claiming missing miles from Continental on United.
So I took a flight on Continental last December. At that time I didn't have a FF account with either United or Continental.
I took a flight on United last month and I just signed up for Mileageplus today and claimed my miles for this recent flight with no problems.
However, when I tried to claim my miles from this December I got a message on the phone system telling me I'd need my boarding passes (which I no longer have) or on the internet the system told me I'd need to pay a $25 fee.
Any advice? I'm a Delta Medallion member and this will definitely be a deciding factor if I am to use United in the future.
Thank you from a newbie!