вільний аеростат
accident-free flying / mishap-free flying
mishap-free flying / accident-free flying
barrage balloon
balloon bed
balloon observation
balloon tire
balloon wing
balloon-launched aeroballistic
ballonet balloon
balloon
balloon envelope
observation balloon
balloon probe
balloon sounding
captive balloon
constant-level balloon
dirigible balloon
pilot balloon
radiosonde balloon
target balloon
contact-free war
contamination-free
fallout-free
free fall
free fall air drop
free fire zone
free mine
free naval control of shipping
free net
free neutron
free rocket
free-fall bomb