Rules or no rules. If Joe Bloggs has spent $15m on a jet, and he says it's ok for one of his punters to sit up front, who on earth is going to lay down the rules at FL410 !
I'd say the only person who would be against it would be the PIC but if he wanted to keep his job, he's most likely to agree to a vist to the front office.
Of course, PIC can refuse on safety grounds, that's why he is PIC.
Let's face it, Mr Tali Ban isn't likely to be on the manifest of a biz jet is he
