Since I live in the Chicago area, I need to wear a coat to the airport most of the year. But I put it in the outside pocket of my checked bag (I always check my bag; hate to carry on anything I don't need or can't check) when I get inside because I don't want to carry/wear it and don't need it on the plane. In the winter I take a fleece parka instead of my heavier coat, so it will fit in the suitcase.