Welcome To Affordaplane Affordable Ultralight Aircraft. What's the cheapest and easiest ultralight airplane to build from plans? One of the best contenders is the Affordaplane - or 'A-Plane' as this sophisticated, yet ultra-simple ultralight is popularly called. The Affordaplane was introduced in 2001 as a back-to-basics, all aluminum, true three axis airplane that anyone could build, especially those on a tight budget.