An example of how it might look to plot

example.geojson

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {
        "airline": "Southwest",
        "departure": "KLAX",
        "arrival": "KJFK"
      },
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [
            -118.4080486,
            33.9424964
          ],
          [
            -73.7786925,
            40.6399278
          ]
        ]
      }
    },
    {
      "type": "Feature",
      "properties": {
        "stroke": "#aa0011",
        "stroke-width": 2,
        "stroke-opacity": 1,
        "airline": "Southwest",
        "departure": "KPVD",
        "arrival": "KDCA"
      },
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [
            -77.0377214,
            38.8514403
          ],
          [
            -71.4277222,
            41.7223333
          ]
        ]
      }
    }
  ]
}