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.

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

Delta Air Lines and Korean Air Lines will acquire an aggregate 25% stake in Canada's WestJet Airlines for $550 million from private equity firm Onex Corp, the U.S. carrier said on Friday. Delta will invest $330 million for a 15% stake and Korean Air will inject $220 million for a 10% interest.