Code-share agreements allow multiple airlines to sell space on the same flight as if it were their flight. The airline selling seats is referred to as the marketing carrier; the airline providing the aircraft, crew and ground-handling support is referred to as the operating carrier.
When booking your code-share reservation, you can identify if any portion of your flight will be operated by another airline. The "Operated by:" section below your WestJet flight number will indicate the operating carrier for applicable legs of travel. The corresponding partner airline will likewise be indicated on the top left corner of your ticket after checking in.
Similarly, WestJet may be listed as the operating carrier when booking via one of our code-share partners.