[pj_mukh]

I think, the guys who built the system for a 100 airports probably know best how to change the system for a 1000 airports while preserving all its advantages.

Maybe NavCanada can slowly scale up by exporting it to bigger and bigger countries until its big enough for American airports.

[VLM]

Note with respect to scalability you're only asking for one order of magnitude. Technologically we've advanced far more than one order of magnitude in the 15 years they've been developing the system, so we NIH'd it and started development here, there should be no technological limit.