Why doesn't Ketchikan International Airport (PAKT) in Alaska have a control tower? The special flight rules applicable to the area (14 CFR 93 Subpart M) seem to make it clear that traffic management is an issue, focusing mainly on being in contact with the Ketchikan flight service station when it is in operation.
The now uncommon situation of an On-Airport Flight Service Station as noted in AIM 4-1-3 would seem to be in force here, but in Ketchikan, it appears that under the SFAR, seen in Ketchican FSS Information, participation is mandatory.
With mandatory participation, what separates Ketchikan from an airport which would normally be served with a control tower? Does it not quite qualify based on traffic?