Conn. Gen. Stat. § 13b-39a
Not later than October first annually, the owner of any aircraft, as defined in subdivision (5) of section 15-34, which is based or primarily used at any airport facility, heliport, vertiport, air navigation facility, restricted landing area or seaplane base in a municipality within this state shall register with the municipality in which such aircraft is based or primarily used, by filing an application form, or renewal thereof, and paying the appropriate registration fee, as provided for in section 12-71, this section and section 13b-39b. The owner of any aircraft which is based or primarily used at any such air navigation facility or restricted landing area in this state shall register such aircraft not later than July 1, 1994, and annually thereafter not later than the first of October. Any aircraft shall be deemed to be based or primarily used in a municipality when in the normal course of its use, it leaves from and returns to or remains at one or more points within the municipality more often or longer than at any other single location outside of the municipality.
Conn. Gen. Stat. § 13b-39a
(P.A. 86-393, S. 1, 3; P.A. 93-433 , S. 9 , 26 ; P.A. 94-175 , S. 10, 32 ; May Sp. Sess. P.A. 94-4 , S. 27 , 80 , 85 ; P.A. 95-160 , S. 64 , 69 ; P.A. 15-192 , S. 8 .)