Pie in the sky.
I believe there should be an airline section in this forum. I am a member of "airlinemeals.net", but I don't think the culinary zeal exists on that forum as it does here. Just a thought.
How many boards do you want? I mean, if there's one for airline food, why not one for ball park food and one for movie theater food and one for food at rest stops...
Boards are for broad topics.
Within a board there are threads. Threads have narrow topics. How about starting a thread on airline food within the General Topics board? See if people want to talk about that in a forum before even thinking about making a whole board devoted to it.