I think the SI should aim for a V-22 Osprey.
en.m.wikipedia.org
Edit:
The other option is a bit faster and more stealty, the YF-23.
en.m.wikipedia.org
Or he could go with a clasic one, the F-14, bonus if it's one from the Jolly Rogers or Wolfpack Squadron.
I do think it would be fun if he could replace the faction symbol with the Assasins Creed symbol, instead.
en.m.wikipedia.org
Two other options, the T1 class and the NR-1.
The T1 USS Marlin SST-2 (T-2), still exist as part of a open to air, museum.
The SI could probably drive up to her, quite easily.
en.m.wikipedia.org
en.m.wikipedia.org
en.m.wikipedia.org
Could he force that death body, true a forced reformat?
Turn it into a trailer, that fits him?
Then it's figuring out how to reverse and modify his drone control gear.
Could let him control that death one as a drone trailer or so.
Unless he could absorb that trailer, in the near future.