https://flyavionic.com/blog/ho....w-to-change-and-upgr

How to Change and upgrade my Swiss Air flight?
You can modify and enhance your Swiss Air travel in a number of ways. You can contact customer care at +1-877-359-7947, or you can use the airline's phone app, website, or OTA at +1 888 915 2449. A third-party website or a travel agency are more options.

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