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by seabass-labrax 22 days ago
It would still be possible to fly a predominantly ballistic trajectory, yet use rocket propulsion to decelerate whilst still outside the atmosphere. It would require a huge amount of extra fuel compared to a purely ballistic trajectory, but perhaps still less than achieving a full orbit and de-orbiting again for some destinations.
1 comments

At global distances a fraction orbital trajectory would use less total rocket delta-V.

More practical would be a trajectory that was a series of small suborbital arcs with skipping off the atmosphere (perhaps with some airbreathing propulsion during the skips.) The thermal protection can cool by radiation between the skips.

That would be very cool to witness! SABRE sounds like it would be an ideal engine for that application.