Today I was driving by Harry Sham Field (MOD), and noticed they have a big new sign at the intersection of Mitchell and Tenaya.
On the sign it says "Est 1927"
Wouldn't that make it one of, if not the oldest municipally operated airports in the US?
I know of College Park MD, but that began as a private field and was never used for commercial airline service as far as I know....could be wrong, there were some unusual routes in the early days of comav.
I've seen Albany, NY claim title as oldest, but I think they started in 1928.