The short answer
Buy the certified systems of record — maintenance tracking, scheduling, accounting. They carry regulatory weight and years of edge cases you do not want to rebuild.
Build only the part that is specific to how you operate and that nobody sells: usually the workflow that joins those systems together.
Compare total cost over five years, including the costs that are left out of both sides: migration, integration, training, and who runs it at 05:00 on a Sunday.
The honest default is to buy
For most operators, most of the time, buying is right. A maintenance tracker, a scheduling system or an accounting package encodes years of regulatory detail and edge cases. Rebuilding that is expensive, slow and rarely a competitive advantage. We are frequently asked to build something that should be bought, and we say so.
When building makes sense
- The workflow is specific to how you operate and is part of why clients choose you.
- The gap is between systems rather than inside one: the screen that shows one trip, one aircraft or one day across four tools.
- Every product on the market would make you change a process that works, or re-key data you already hold.
- You need to own the data and the code, for example to move between vendors without losing history.
The costs that get left out of the comparison
When buying, the licence is the visible cost. The rest often isn’t on the page:
- Migration and cleaning of historical data.
- Integration with the systems you are keeping.
- Training, and the productivity dip while people learn it.
- Workarounds for the parts that don’t fit, which quietly become spreadsheets.
- Price rises and the cost of leaving, once your data lives there.
When building, the first release is the visible cost. The rest often isn’t:
- Hosting, monitoring and security.
- Someone on call when the dispatch desk depends on it.
- Change control an auditor can follow.
- Keeping integrations working as vendors change their systems.
- The knowledge risk if the people who built it leave.
The usual answer: buy the core, build the joins
The pattern that works for most operators is to keep the systems of record, buy where a good product exists, and build the thin layer that joins them: one trip record, one set of definitions, one screen for the decision in front of you. It keeps the certified systems where they are, and puts custom work only where it earns its keep.
How to decide in two weeks
Write down the costs of both options over five years, including every item above, for one specific workflow, using your own data. If the answer is to buy, you have a vendor shortlist and a cost to negotiate against. If it is to build, you know exactly how small the build can be. Either way it is a written answer, not a sales conversation.