My sister gifted me the full Travel set! The Airplane was the second one I tackled. The edges came together pretty easily, except for that missing piece...it never did show up. Separating the colors required a couple of re-sorts and strategy changes, with so many colors bumping into each other. I like challenging patterns, and loved this puzzle. In the end, Blue Kazoo could not send me just the missing piece, but sent it via a full new puzzle. So I will work it again, for completion. Tha...