With Delta and WestJet eyeing joint venture, are United and Air Canada next?: Travel Weekly

Approval of a Delta-WestJet joint venture could spur Air Canada and United to begin taking advantage of antitrust immunity they've had since 1997.  

Aero Pacific Flightlines: August 2018

WestJet and Delta joint venture. What's the impact? - Travelweek

Delta and Canada's WestJet agree on joint venture

Delta-WestJet Joint Venture No Longer On The Cards

U.S. government approves alliance between WestJet and Delta, with

WestJet alliance with Delta gets conditional approval from U.S.

Westjet slams Air Canada - Transat merger approval - Western

WestJet, Canada's second-largest airline, will be taken private

PAX - WestJet undecided on whether to renew joint venture with Delta

A New Old WestJet - Airline Weekly

WestJet, Delta To Submit Revised JV Application