Would like info on how easy it is to change departure point. I am booked on
a flight from Munich (KLM) to Amsterdam but would like to change the booking
to Salzburg via KLM partner Air Alps.

Question, do I ask KLM - before departure for Europe (in May) or do I wait
until I get to Europe, even waiting till last minute. Are airlines (KLM)
accomodating with situations like this?

Thanks...