Actually, that depends. For example, a path that takes the missile high in the start to get the orientation right and then brings it down for the final leg with ground matching is common. The physical configuration also varies - the Klub is different from the Tomahawk is different from the Scalp. I think someone else covered why the initial speed isn't all that great, so I'll just assume you can read.
Of course, to know any of this stuff I probably ought to be a Dr. Divinity or a Bishop (or at least a Pastor) or something.
If that was a reference to me, I am a foot surgeon ("DPM" - Doctor of Podiatric Medicine, i.e., a Podiatrist.) I have never claimed to be an expert on anything related to this debate. I just talked to the first hand witnesses, and related their opinions.
One of them thinks it might have been a missile, but he's not sure. One of them said it definitely was not a missile, based on the fact it was in view for almost five minutes in his photos. My contention all along has been that SLBMs do not create an exhaust plume for 5 to 10 minutes.
No one has proven Leyvas' main point, that the object disappeared from view after 2 to 3 minutes.
On the contrary, the opposite view has been established: the object creating the contrail continued creating a contrail throughout Leyvas' video as well as throughout Warren's photos, which represents a time frame of over ten minutes.
Missiles do not create exhaust plumes for over ten minutes.
Airliners do create contrails, given the right atmospheric conditions, as long as they are flying in those atmospheric conditions.
Every possible scenario that could "prove" this was a missile has been dismissed. There's nothing left to debate.