Indian Airlines has extended its frequent flyer enrollment drive to Sept. 30.

The promotion, which offers membership in the Flying Returns program to anyone flying a single sector on Indian, Alliance Air or Air India, was originally slated to end this summer.

Normally, membership requires a fee of Rs 1,000 or the presentation of five boarding passes from the previous three months.

Under the terms of the enrollment drive, the passenger is required to fill out an enrollment form and enclose either the original boarding pass or a photocopy of the original boarding pass and ticket jacket, which may then be dropped off at the airport or at any member service center.