I have nothing to base this on, I always thought we could do that. The airlines just don't, because (most) passengers won't get on a plane if they don't get to

I have nothing to base this on, I always thought we could do that. The airlines just don't, because (most) passengers won't get on a plane if they don't get to hear that Air Force baritone come over the intercom and say "This is your captain speaking...". I didn't think it was a matter of tech but of psychology.