Lol, as someone who has spent A LOT of time on the ramps of pretty much every major airport in the country, BBQ grills are pretty common, and the propane is not a safety issue whatsoever. The Boeing 767 that I typically would fly holds between 16-24K gallons of fuel, and is typically fueled at the gate.

My only issue with the pic and the grill, is that it appears to be nicer than the one I have at home!