Air Routes sample (US airports + domestic routes)
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This directory contains a US-only subset of the **air-routes** graph published by
Kelvin R. Lawrence as part of *Practical Gremlin — An Apache TinkerPop Tutorial*:

  https://github.com/krlawrence/graph

Upstream project license: Apache License 2.0
Copyright for the air-routes dataset: Kelvin R. Lawrence

The full upstream CSVs (`air-routes-latest-nodes.csv` /
`air-routes-latest-edges.csv`) were filtered to:

  - airports with `country == US`
  - routes whose endpoints are both in that US airport set

No airport or route records were invented. Column names were normalized for
GraphForge seeding (`id`, `code`, `city`, `region`, `runways`, `elev`, `lat`,
`lon`, `desc` for airports; `from`, `to`, `dist` for routes).

See `LICENSE` in this directory (Apache-2.0) and the upstream repository for
the complete license text.
