To pick a specific nit: an air base that hosts bombers engaged in an ongoing conflict is a legitimate military target, and thus an attack on it by an enemy participant in that conflict does not constitute "terrorism."
apnews.com
5 men arrested near UK air base used by US in Iran war on suspicion of preparing a terrorist act
British police have arrested five men near RAF Fairford, an air base used by the United States during its war with Iran, on suspicion of preparing an act of terrorism.