Maybe there's a SasS opportunity for you to explore.
The PDF standard is a mess, and the number of 'tricks' I've seen done is astonishing.
Example: to add shade or border effect to text, most PDF generators simple add the text twice with a subtle offset and different colors. Result: your SaaS service returns every sentence twice.
Off course there were workarounds, but at some point it became unmaintanable.
The demand for automating text extraction is still very high — or at least it feels like it when you’re working around the clock to cater to 3 of your customers, only to wake up to 10 more the next day. We’re small but growing extremely quickly.
It’s definitely harder to get government business because the sales process is so long and compliance is so stringent. That said, we are GDPR compliant.
I've bookmarked your site for future research... but the aviation part has me curious!