The Phoenix made its warp flight in 2063, and the Federation is founded in 2161. Enterprise gave us a glimpse of pre-Federation Starfleet from 2151 to 2155 plus the NX-01's final mission in 2161. We've four NX-class ships: the Enterprise NX-01 in both the prime and mirror universe, the Columbia NX-02, and the Avenger NX-09 (I think) in the MU. We saw bizarro takes on the Enterprise in "Twilight" and "E2" as well. There's the Intrepid-type, the upgraded version of the ship that flies over the moon in the intro, and that weird transport ship that popped up a few times in S4. In S2's "First Flight," I think the Warp 2 barrier was broken some 10 years before the NX-01 Enterprise with a pair of NX-type test ships that were basically Archer-era takes on the Phoenix. Beyond added in the Franklin, the Warp 4 prototype which would slot somewhere between "First Flight" and "Broken Bow." This has me wondering, when did Starfleet become a thing, and how many Starfleet ship designs were there prior to the NX-01?
There's the NX-class, the Franklin (did it go into production?), the Intrepid-type, the moon ship (don't know what to call it), the NX-test ships, that transport ship (I'm assuming it's Starfleet and not civilian), and... was that it?
What do you guys think of that weird NX-class "upgrade" with the addition of a secondary hull? I never got the point of this, except "new and different is bad."
There's the NX-class, the Franklin (did it go into production?), the Intrepid-type, the moon ship (don't know what to call it), the NX-test ships, that transport ship (I'm assuming it's Starfleet and not civilian), and... was that it?
What do you guys think of that weird NX-class "upgrade" with the addition of a secondary hull? I never got the point of this, except "new and different is bad."

On TNG and Enterprise, was it an obvious reference, or easier to miss if you're not looking for it?