There’s little to appreciate here. Just more confusion and a draconian view of modern communication.
Apparently, its OK to share expenses with friends and family, so long as they happen to be at the airport when I hand tack said invitation to the local airport bulletin board. One would assume that a cork bulletin board would fall into the guidelines, but how about a magnetic bulletin board? A magnetic bulletin board might prove too “fancy” for such endeavors and indeed would be holding out.
After all, If I use Gmail (an internet app used by the public) to see if friends want to come along, its apparently frowned upon. If I communicate the details of the trip on my flight schools Facebook page (an open social media page for the student body at a school), I’m “holding out”.
Can the invitation be typed, double spaced or must it be handwritten? Can a cell phone be involved or must it be a landline? Telegram or pony express?