The shelter or NATO classification HAS (hardend aircraft shelter) is, according to official language, a buliding for proceting aircraft made of thick, reinforced concrete walls for single combat aircraft. Please note the typhoon is not included.

The shelter or NATO classification HAS (hardend aircraft shelter) is, according to official language, a buliding for proceting aircraft made of thick, reinforced concrete walls for single combat aircraft. Please note the typhoon is not included.