I sure as heck want everyone else on the plane with me to be compared against their photograph.
Why? I'm sure there's nefarious activity that could be prevented, I'm just struggling to identify activities that would make be feel (let alone actually be) unsafe on an airplane as a
practical matter, and without doning a screen writer's hat.
I'm assuming weapons are already adequately checked. And if not I'm not sure how facial recognition would appreciably help in this regard. Sure, maybe 12 bad guys enter the system though 12 airports with lax security, then all board the same flight at a major hub in a manner that circumvents analytics that searches for suspected bad guys flying together. But that already makes some dubious assumptions, such as the degree of efficacy in the system looking for suspected bad guys traveling together.
For most of air travel hijackings and bombings were incredibly common. We all but solved that by the 1980s by physically screening for weapons and suspect material, not by pretending we could predict people's behavior.