Is anyone familiar with the Fort Myers area and these designations shown?

[normr]

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[PJHoward]

Class D is 36-53M wingspan.
See:
http://ardent.mit.edu/airports/ASP_current_lectures/ASP 04/Airfield_Capacity_04_bw.pdf

 

[tcope]

Yes... but you don't explain what you are questioning. Airports have different classes:

Airspace class (United States) - Wikipedia, the free encyclopedia

 

[Air Ontario]

That is a 5 or 5.6 nm radius of controlled airspace up to an altitude of 3000 ft. generally. ATC and permission to enter for aircraft.