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Hi Martin,
Welcome!
You could also consider large binoculars ... I'm not sure you'd get much more advantage from a telescope that needs to fit into checked luggage?
aperture however is what helps with planetary resolution, so if you were to get a scope a mak-cas, or similar may work but i think they are pretty heavy... a 5-6" would be alright although i don't know how you'd fit a tripod in too. i'm sure there are others on here with some travel scope experience.
all the best
rusty
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