As implied by Sam's and Argos' comments, it is critically important to clearly understand the goal and intended audience for an advertisement before one tries to come up with a really good design. In this case, I'm confused by your statement:
Specifically, does your statement mean that your company both sells jet engines AND they provide some sort of training related to them? If it's both, that fact could be used to your advantage in the ad, but as is, you are not taking advantage of it.
My next comment is that you are not being clear about whether the training your company provides is to learn how to design engines, ie, essentially an undergrad + graduate degrees in engineering, or the training you provide is at a much lower level on how to maintain them. This difference has a huge impact on your target audience, and hence, on how you design both the graphics and text for the advertisement.
Once we know exactly who you want to reach and what message(s) you want to get across, we'll be able to make much more meaningful suggestions.
Tom M
PS - FWIW, I taught engineering design for many years to seniors at a major university and one of my two minor subjects in grad school was aerospace engineering, primarily in the supersonic range (eg, shock effects & flow diagnostics)
