I recently used a new-to-me towncar service (Carmel...the 212-666-6666 one) on a trip from EWR into Manhattan. When I made the reservation on the website it gave me the option of entering my AS #. After the trip, my account was credited 146 miles. This was a pleasant surprise, and I was wondering if folks know of similar opportunities in Seattle.

I know if you use MasterPark you can earn miles, but for those of us using cabs/towncars to get to the airport, I wonder if other options exist. Given that I probably take 20+ roundtrip cab rides to the airport each year this would not be insignificant.