HOW IS THIS DONE? I JUST GOT THIS RESPONSE FROM UNITED:
Dear Mr.--------
We’re always glad to hear from MileagePlus® members like you. Thanks for writing.
Unfortunately, the miles need to be authorized by the car rental company. There are times when the rentals are not eligible for credit, and we would not know this.
Please visit
www.united.com/retrocredit and in the "Non-airline partners" section, click on “Car and ground transportation partners” for address and phone contact information.
We appreciate you taking the time to contact us.
Regards,
Gavin Martin
MileagePlus® Lead Representative