The U.S. Aeronautical Information Manual, part 3−2−6, lists a variety of airspace areas which may be designated type E. From reading this section, I get the impression that "typical" class E airspace consists of regions near non-towered airports, plus everything from 14,500' MSL to 18,000' MSL.
The word on the street, however, is that this is not an accurate picture: In reality, class E airspace typically goes all the way from 1,200' AGL to 18,000' MSL, with dips down to 700' AGL around non-towered airports. I.e. apart from a thin layer of class G airspace near the ground, almost all airspace away from towered airports is class E. This is hard to notice on sectionals, since the only place it is mentioned is in the legend, where there is a footnote stating "Class E Airspace exists at 1,200' AGL unless otherwise designated as shown above." I gather this widespread sort of class E airspace falls under the provisions listed in AIM 3-2-6e4 and 3-2-6e5.
So I have two questions regarding this:
- Is there anywhere in the Coterminous U.S. where class G airspace extends up to 14,500' MSL? (Excluding the trivial case of mountainous terrain above 13,000' MSL; c.f. AIM 3-2-6d1b.)
- Since the existence of class E airspace from 1,200' MSL upwards is so ubiquitous, why is this not codified like the 14,500' rule is?