The Navigraph API does not currently support taxiway information which is limiting companies like BeyondATC creating accurate ATC taxiing instructions.
Navigraph has a way of sharing that information. SayIntentions went into agreements with them to access the data. It includes taxiway information for roughly 1000 airports worldwide. It’s still requiring a significant amount of work from the user base to even make that data viable for AI generated taxiway instructions. The end product so far has been pretty outstanding.
BeyondATC rejecting it has nothing to do with the data Navigraph can supply.
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Many thanks for the info 
Back to BATC it is.
@qazme1982 is correct! We have several ways of delivering this data to third parties, and we already have multiple developers working with it.
We’re happy to help them out with the integration if needed but as you say, this is up to BATC!
Kind Regards,
Malte