Europe_flight

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://d3js.org/topojson.v2.min.js"></script>
  <script src="https://d3js.org/queue.v1.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .region:hover{
      opacity: 0.6;
    }
  </style>
</head>

<body>
  <script>
    
    var w = 960;
    var h = 500;
    var q = queue();
    
    var projection = d3.geoConicConformal()
								   .center([ 10, 46 ]) //comment centrer la carte, longitude, latitude
								   .translate([ w/2, h/2 ])
								   .scale([ w/0.66576384 ]);
    
    var path = d3.geoPath().projection(projection);
    
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", w)
      .attr("height", h)
    
    q.defer(d3.json, "world-50m.v1.json")
    .await(processData);
   
    svg.append("path")
    .attr("id", "graticule")
    .attr("fill", "none")
    .attr("stroke", "#777")
    .attr("stroke-width", 0.5)
    .attr("stroke-opacity", 0.5)
    .attr("d", path(d3.geoGraticule10()));
    
    function processData(error,world) {
      if (error) throw error;

svg.insert("path", "#graticule")
      .datum(topojson.feature(world, world.objects.land))
      .attr("fill", "#00154c")
      .attr("d", path);

svg.insert("path", "#graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) {
    return a !== b; }))
      .attr("fill", "none")
      .attr("stroke", "#fff")
      .attr("stroke-width", 0.5)
      .attr("d", path);
      
          // points
    aa = [43.6140, 1.3620];
		//bb = [-122.389809, 37.72728];

console.log(projection(aa));
      
      svg.selectAll("circle")
		.data([aa]).enter()
		.append("circle")
		.attr("cx", 350)
		.attr("cy", 270)
		.attr("r", "8px")
		.attr("fill", "red")

}

</script>
</body>

Modified http://d3js.org/queue.v1.min.js to a secure url

https://d3js.org/d3.v4.min.js

https://d3js.org/topojson.v2.min.js

https://d3js.org/queue.v1.min.js