Delta Air Lines and Korean Air have both acquired minority shares in Canadian carrier WestJet, with Air France-KLM also set to benefit from the investment.

Delta Air Lines (NYSE:DAL) and Korean Air announced on Friday that they will strengthen their respective partnerships with WestJet through the purchase of minority equity stakes in the Canadian airline from Onex Partners.

The investment comes at a shaky moment for travel between Canada and the U.S., with Canadians taking fewer trips to the U.S.