Large aerospace companies are constantly working on modifications, repairs, upkeep that all require significant analysis. For a commercial jet, something like a truck driving into a jet engine nacelle might entail significant engineers' time (CFD, FEA etc.) because the safety margins for aircraft are so small. The results might be a once off-repair, or it might lead to a redesigned part that is put into production. It's usually not that interesting to the public though.

- Worked at one, know others still there. Truck example is real.