I can't imagine a serious investor that doesn't consider oil price volatility when deciding whether or not to invest in an airplane company. You seem to be assuming that all of the investors are abjectly incompetent.
You can think of lots of reasons why, but it mainly boils down to this: VCs are hired to make bets within an asset class (startups) and not outside that asset class. Institutional investors (upstream of VCs) have other managers to do commodities etc.
Also, at least in theory, the market price of oil takes all info into account. If the VCs could really predict the price of oil in 3-5 years, they should probably be trading that alpha instead of investing in VC.
That doesn't mean that the investment isn't expected to be hurt (or wiped out completely) should the price of oil rise, it just means that a competent investor would have looked at that possibility and decided that the investment was still worthwhile.
The comment I was responding to IMO assumed flippancy on the part of investors and implied that they would be surprised by an increase in oil. That's absurd.