Perhaps this is a dumb and paranoia-induced question, but if my POI has already booked plane tickets for me to come to interview weekend (at UT Austin EEB), should I be worried about not being invited to interview weekend? I've gotten no formal notification from the Department that I've been invited, but I don't think my POI would buy nonrefundable plane tickets for me if she wasn't absolutely sure that I would be invited. I'm not expecting anyone who hasn't applied to UT themselves to have magical insight into the inner workings of UT Austin's EEB invite process, but I'd like to hear others' thoughts about this.