CP140

The answer is a not a difficult one to calculate with some relatively low level algebra.

Let x=Number of airplanes that causes spouse to get irate.

Let y-1=Number of airplanes that fit in (workshop+basement+attic+workbench). The factor of -1 allows for having one in van ready to go.

Let z=maximum number of memory locations in transmitter(s). (if using non computer radios, then z=x)

Let n=ideal number of airplanes.

n is the least of x, y, z