Originally Posted by
auggie doggie
Is using the lavatory in your ticketed cabin a Federal Air Regulation? I know that (for example) some flight attendants say that "due to United Security Policy" you have to use the lav in your ticketed cabin while others say "due to Federal regulations". Which is it?
It's not in the FARs. The rule is from a TSA Security Directive issued a few years ago. You will get to read the Security Directives only if you have a need-to-know.
Originally Posted by
auggie doggie
Also, are the lavatory rules different for domestic flight vs. international flights?
Yes - the TSA Security Directive requires that airlines announce the rule on inbound international flights - Thou shalt use the lav in your ticketed cabin. Airlines are, of course, free to announce and enforce the rule on a more restrictive basis if they wish. If UA wants to announce and enforce it on outbound flights or domestic flights, that's UA prerogative.