Airship includes blimps, so, since the 1930s? A reasonable number, small but not zero, single-digit-per-decade it looks like. I don't understand your objection

Airship includes blimps, so, since the 1930s? A reasonable number, small but not zero, single-digit-per-decade it looks like. I don't understand your objection to the sentence even if it said "zeppelin" frankly.