mileage ticket

noun
  1. a book (mileage book) or ticket containing coupons good for a certain number of miles of transportation at a fixed rate per mile.
  2. one of the coupons.

Origin of mileage ticket

An Americanism dating back to 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018