Interesting question, until I got the 150-600 none of my lenses has IS/OS/VC, although I did rent the 100-400 L at times. I was shooting with unstabilised lenses, either cheap xx-300 zooms or a Centon 500mm f/8 mirror lens. I shot a wide variety of subject matter with these lenses, and still do with the Sigma 28-300mm. If my subject will allow the use of high shutter speeds then I tend to get more keepers than I would if I needed to use a much slower shutter speed. When it comes to using the 150-600mm or the 100-400mm before that I would usually keep the stabilisation turned on even when switching to a much faster shutter speed. I only ever rented the 100-400 for airshows, and the majority of the ones I attend feature far more propellor driven aircraft than jets, so I am usually shooting at 1/160s or slower. At those shutter speeds I need all the help I can get, so use the stabilisation in mode 2. When a jet is displaying I will up the shutter speed to as fast as I can get while still using a sensible level of ISO, usually I aim for between 1/1000 and 1/2000 although I would have no worries about going to 1/8000 if the conditions allowed it. I usually leave the stabilisation on in this situation, since it also helps in keeping the subject well framed, with the AF point where I would want it. The thing is though that a jet aircraft, even one travelling at 500 Kts plus, is actually a very easy subject for the AF system to track, even when heading directly towards you. Jets, and most other aircraft types, regardless of speed, travel in very straight lines, at very constant speeds so as far as the AF system is concerned they are simple subjects to track. So I really don't think that the slight reduction in AF system speeds caused by the use of the stabilisation system is going to adversely affect your keeper rate. The only aircraft types that I can think of that might be able to stress the AF system are the competitive aerobatic types from the likes of Pitts, Extra, Sbach and the likes. Since these are all prop aircraft I am going to be shooting them at 1/160 or slower anyway for prop blur reasons, although with some of them being able to roll at in excess of 540 degrees/second wingtip blur can then become an issue.
Just remember that it is subjects that change velocity (i.e. speed AND direction) quickly that are likely to be difficult for the AF system to track, and so may benefit from turning off the stabilisation system. But you still have the challenge of keeping the AF system pointed at the correct point, so as with all things photographic YOU have to assess which gives you better results. I know that JohnF finds that he gets better results for his BiF photography with the IS off on all his lenses, except maybe the 100-400 V2 in Mode 3, at just about all shutter speeds. I find that for aircraft I get the opposite, far better results with stabilisation, in Mode 2, even at higher shutter speeds. So John advocates turning it off, and I advocate turning it on, and for each of us we are both correct, since we both have evidence to back up our positions, the number of keepers that we shoot.