Are there any sub-/transsonic planes that are able to go supersonic in a dive without damage nor losing control but can't go above Mach 1 in horizontal flight? Some planes can go into leveled supersonic flight on afterburners only, but I mean planes that don't have any.
Pretty much every early jet comes to mind. Think the Me262, the F-86, the Mig-17. All could go slightly supersonic in a dive without damage (if not kept up for long, obviously) but not in level flight.
I've heard that some jetliners can go slightly supersonic in a dive without damage. Again, only if they pull out quickly and don't stay in the supersonic regime for more than a few seconds, but I've not seen hard data on that.
I've also heard of a souped up G650 that can go supersonic in a shallow dive and and maintain that once reached in level flight and is actually rated for it with a limit of 10 minutes between inspections (iow, the certification authorities are confident it will not take damage for the first 10 minutes of supersonic flight). But that might be exageration on the part of the person who told me about it (supposedly it's a one off conversion including uprated engines, an extra fuel tank, and stronger structural beams).
I'm sure there are other examples.