Gather you fly in and fly out of your work destinations as you say - so sounds like you need a set up like people who go eclipse chasing! One key thing is if you want to just do visual stuff or if in the future perhaps also take some photos. Perhaps also work back with the baggage allowance you have in KG's.
- something like a 3.5" mak-cass like this
http://www.meade.com/etx/specifications with a hard case could do the trick for you.
- if only visual, a telescope like this could do the trick
http://www.scientificsonline.com/ast...telescope.html
- my money would be on something like a 4" or 5" short focus refractor with a hard case
http://www.telescope.com/Telescopes/...7/p/103506.uts and you can either put this on an altazimuth mount when you are travelling or try and get a small equatorial mount.
I have a small 80mm refractor with a photo tripod that I take with me with a hard case - 80mm I find is too small and really binoc's could do the trick.
Overall, go for the biggest aperture you can squeeze into a case / bag allowance as this will give you the best views across both planetary and deep sky.
Let us know what you end up with.
John K.