Yeah, as of a couple of weeks ago I also can't find the 2nd flight to DUS, which was available for sale and expected to begin in April 2024, twice weekly. No idea where those aircraft are going to be redirected to, but that's certainly unfortunate and won't do anything to keep prices on a sane level in 2024.

Despite such changes, they insist on keeping some red-eye flights to HAJ and from CGN, which also doesn't help prices much, since the morning DUS flight is basically the only viable option remaining. Last year, 2022, HAJ was initially scheduled as an overnight flight but changed to a morning flight around February, long before the flights started. However I don't think I want to wait that long on a bet (or even worse book now and hope it gets changed again), since times have changed and by February all other prices would have gone considerably up.