I am trying to retrieve information on the total area constantly covered by commercial passenger airplanes in flight (that is, airborne planes, not planes on the ground).
To this end, I've been trying to obtain formal/documented information (preferably from a source like the FAA) on the major types of commercial passenger planes, the total planar cross-sectional area (planform area) of each type of plane (as viewed from the top of the plane), and the average number of each plane type that is airborne at any time. I am looking for data similar to those shown here, which was in an article I've been reading. That data is from 2006, and I am looking for data which is recent (i.e. preferably within the last couple of years). Number of passengers and height of the aircraft is not important for me.
I've been searching on the FAA website, but I can't locate anything relevant. Don't know if it is just me, but I find it hard to easily search for information there. I welcome guidance on how to calculate said area based on freely-available data.