As I recall, during the map rewrite there was a special condition for the airport sectional pages (eg https://flightaware.com/resources/airpo ... /sectional
) that allowed for a greater-then-normal zoom level. During the course of the rewrite, I got rid of special conditions like that in favor of having standardized zoom limits across the site - so it doesn't surprise me that the sectional map can't be zoomed in as far as before.
The big problem is that the sectional imagery is of such low quality. We're looking at making a vast improvement in the quality of this imagery soon, but there's not a specific timeline I can point to right now.
In the meantime, I'll take a look and see if it's workable to increase the max allowed zoom on the sectional layers.