One person of 6 missing return flight. Should I call the airline?

My family of 6 flew from the US to Europe last week. My husband ended up needing to leave two days earlier than planned because of work so he booked a different return flight. My kids and I fly home tomorrow and he is still on our reservation but won’t be checking in. Should I alert the airline before the flight or will they give up his seat because he never checked in? --- **Post Details:** - **Subreddit:** r/travelhacks - **Author:** u/bratatat-tat81 - **Score:** 82 upvotes - **Upvote Ratio:** 89.0% - **Comments:** 38 - **Posted:** 7/14/2025 - **URL:** https://reddit.com/r/TravelHacks/comments/1lzu8u3/one_person_of_6_missing_return_flight_should_i/