Thank you very much for your replies. I’m allways trying to get the most out of the photos I take. The gear I have is a good old Canon 50D with a Canon EFS/IS 17-85 for taking photos such as 14 and 15. But most of the time I use my black stallion the Sigma 50-500MM APO/HSM. I’ve chosen this one above the Canon 100-400 because I like to make all kind of photos and I don’t like to be limited and begin at 100mm.

I do a lot of research at photo locations before travelling to the airports themself. This can be done via google maps/google and some different forums. You can also use this: http://www.scramble.nl/airports/index.html
I found out it’s very usefull and most of the time it’s well explained.

Again thanks for the replies, I will post Innsbruck and Munich this weekend.

Maikel