I've encountered telephone login systems which ask me to type in my password in its numeric form (e.g. if my password was 'password', I'd type 72779673) If Jet

I've encountered telephone login systems which ask me to type in my password in its numeric form (e.g. if my password was 'password', I'd type 72779673) If JetBlue has a similar logic system via the phone, I can see why Q and Z or prohibited to allow this existing authentication system to work.