I sometimes have a bit of clogging when the (wooden) recorders are on their way to getting wet. I.e. no problem when the recorder is completely dry, no problem once the water is dripping (unless a drop is blocking the thumb hole), but in between the sound gets lost. The only solution to that is continuing to play, as far as I know, possibly blowing or sucking.
The usefulness of anti-condensation liquid is disputed - I've read recorder makers (or at least one, but can't remember which) who say not to use it on new recorders because the water needs to find it's way out of the beak naturally. I don't even own any.
As for the plane, I'd absolutely insist on taking the recorder in the cabin with me - you might check beforehand the airline's regulations. First of all, I don't know whether all cargo holds are pressurized and heated (some must be when they transport animals there), secondly there's always a risk of loss with checked baggage and thirdly baggage handlers, well...
https://www.youtube.com/watch?v=5YGc4zO ... ayqf2wv01KDo you have to travel with your good wooden recorder or might more easily replaceable plastic do?