CALGARY -- The company that runs the Air Miles loyalty rewards program is the target of a proposed class-action lawsuit.

A statement of claim filed with the Court of Queen's Bench this week alleges LoyaltyOne Co. made unfair and unilateral changes to the program's terms and conditions.

Air Miles racked up before December 31, 2011 are set to expire at the end of this year and miles collected after that are to expire five years after they are earned.

The proposed suit, which has not been certified, claims users were not given adequate notice of the changes and that the company has made it difficult for miles to be redeemed before their expiry.

Air Miles are earned by shopping at participating retails and are meant to be exchanged for flights and other rewards.

The plaintiff in the case is a Red Deer, Alta., man who had been saving up miles for a dream vacation to the South Pacific that he otherwise could not afford.