Just did this and am still congratulating myself.
We started our January trip in St Louis, where it was 20 degrees.
We put on our winter coats for the trip into the terminal.
Then we stuffed them into the empty duffel bag I had brought and checked it.
We didn't have to mess with carrying our coats in the airport or try to stuff them under the seats on the plane.
Of course, they arrived in our room with the other checked luggage, but we really didn't need them until we got back to St. Louis, where we reversed the process. Got duffel bag off luggage carousel, then bundled up, because it was STILL 20 degrees in St Louis!
We started our January trip in St Louis, where it was 20 degrees.
We put on our winter coats for the trip into the terminal.
Then we stuffed them into the empty duffel bag I had brought and checked it.
We didn't have to mess with carrying our coats in the airport or try to stuff them under the seats on the plane.
Of course, they arrived in our room with the other checked luggage, but we really didn't need them until we got back to St. Louis, where we reversed the process. Got duffel bag off luggage carousel, then bundled up, because it was STILL 20 degrees in St Louis!