Originally Posted by
rickair7777
If you know exactly where he's supposed to be and when.
If it's clear out.
If you acquire the correct set of blinky lights from miles away.
If he's not late.
If you can get catch up without resorting to afterburners.
Or perhaps you've done subsonic night VFR intercepts without GCI or radar?
Not saying it absolutely wouldn't work but the odds are low enough that nobody would think it was a good plan.
Or if you're tuning and listening to the radios and hear an estimate to a waypoint and set up an RTA to that point for the other flight's ETA...