[mppm]

"Fast enough" is very nearly orbital speed, though. Suborbital range is very short on the lower end, and increases rapidly and nonlinearly later. E.g. if you can boost to 2km/s (~ Mach 7), this gives you, I kid you not, around 200km of ballistic range. It's either atmospheric flight or orbital flight, and there's nothing really useful in between.

[pfdietz]

One possibility is a trajectory that's a series of skips.

[adastra22]

GP is not talking about a ballistic trajectory though.