This is the same situation at every single airline, without exception. If you fail to show up for your outbound trip, the return flights are all cancelled. The major airlines use the argument that your "contract" was for a discounted roundtrip and you violated the contract. Often, one way fares are more expensive than roundtrip. There are two exceptions here. Southwest and Frontier's fares are all one way. So, if you fail to show up for your outbound your return will be cancelled, but Frontier will reinstate your flights without charging you anything, provided your original flights still have seats available.
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