An aircraft is not equally vulnerable at all times. The phases in which it flies low and slow — take-off, climb, approach and landing — coincide exactly with the altitude band where most drone types operate. The same applies to tactical low-level flight during the cruise phase.
Key point
An aircraft parked on the ground shares the same vulnerability: loitering munitions and FPVs are proven effective against static targets — see the precedents in Chapter 5.1.
This also underpins the "Survive" layer of the self-protection framework: see Chapter 7.4 for how procedures can address this vulnerability.