Most airplane ovens can either use convection or steam to heat, says Jones – and can contain as many as 40 or 50 meals at a time. “On a large aircraft you could have maybe 10 or 12 ovens.” he says.

What if an aircraft could lift off like a helicopter, fly like a plane, and still be compact enough to land on a building’s roof — all in one trip? Canada-based Horizon Aircraft has created one such ...