Data Ownership a bigger issue
"However, with machinery such as jet engines collecting hundreds of gigabytes of data per use"
This data is very useful or a summary of it, but currently the owner of the plane does not own the data, the manufacturers currently say they own it and indeed they collect it.
Same for the Airframe data.
The way i see it if you own something you should own the data it produces but its not that simple.
The legal area here is very grey and will have to be written into contracts but contracts have to be agreed by both parties and manufacturers have no interest in letting go control.