Is there any comprehensive source for landing fee information for US airports?
Airnav and the facility directory do not have landing fee information.
Also, going to airport web sites often is useless. For example, Massport lists landing fees for Hanscom on their web site, but do not list their fees for Logan.
Note that landing fees can be complicated. For example, there can be "landing fees" and "ramp fees" and others. So, usually the fee information is for a bunch of different stuff.