CALGARY — WestJet is advising passengers that its mileage program partnership with American Airlines is ending as it pursues closer ties with Delta Air Lines.

A notice posted on the Partners section of WestJet’s website says: “Please be advised that our partnership with American Airlines is ending. Premium earn on American Airlines flights for Silver and Gold members is no longer available as of December 20, 2017; regular earn for all members (as indicated below) will cease on July 31, 2018.”

The partnership awarded WestJet dollars on American Airlines-marketed and operated flights (including American Eagle and AmericanConnection flights) based on distance flown, plus class of service bonus, when applicable.

An alert on the Partner Airlines section of American Airlines’ site, headlined WestJet partnership ending, confirms that July 31, 2018 is the last day that AAdvantage program members can earn miles on WestJet.

As reported on Travelweek.ca on Dec. 6, 2017, WestJet announced it was strengthening its existing partnership with Delta Air Lines with a new joint venture that gives passengers more travel options between Canada and the U.S.

The two airlines, which earlier this year expanded their reciprocal frequent flyer agreement, are entering into a preliminary memorandum of understanding that will offer customers access to an extensive transborder route network, airline products, enhanced frequent flyer benefits, and shared airport facilities and amenities.