Yes.
Also, it should be noted that while Sammaels jetbike is supposedly the only one, the Corvex, but he constantly gets it into combat and it has been destroyed a good few times, yet it still reappears relatively undamaged, which means that they either have someone really fucking good at repairing it in Ravenwing, or they sit on some hidden stash of jetbikes they keep for the Master of the Ravenwing, or, even better, they have the Jetbike STC but refuse to share and somehow managed to stop Mechanicus from trying to murder them for it... or there is warp-fuckery involved and Corvex is actually a fucking deamon in machine. None of these wouldn't suprise me, considering, you know, Dark Angels.
Although, there is some relative chance that there are some hidden-off jetbikes around, with Custodes most likely keeping the last ones for Kataphraktoi, perhaps some Dark Angels successors having some, Mechanicus gently pressing their mecha-dicks into exhaust of some long-forgotten in deep vault under Mars to maybe create some jetbike babies, and so on. Imperial Jetbikes in 40k are very damn rare, since the STC got fucked during Horus Heresy and they got picked-off during the 10,000 years since then, but it's hard to believe there is only one in whole Imperium, more likely the remaining ones are just hidden away because they are so rare and valuable, and Ravenwing are the only ones still using one on field.