the annual, live fire training/show of the Swiss air force, is open to the public. you have to walk up, if you are not invited by the armed forces, guests of the armed forces, will be transported by helicopter.
this event is 2,200 m above sea level.

for more info's
http://www.lw.admin.ch/internet/luftwaffe/en/home/aktuell/airshows/axalp_ebenfluh.html