1. Hi Mick,

    is there something strange in this video? I mean, is it usual two planes passing closely in this way?



    Thank you!
     
  2. Jay Reynolds

    Jay Reynolds Senior Member

    This is a fairly complete general explanation of separation:
    http://en.wikipedia.org/wiki/Separation_(air_traffic_control)

    However, its possible these flights are at RVSM altiude, where other rules apply:
    http://en.wikipedia.org/wiki/Reduced_Vertical_Separation_Minima

    Its also possible that there was a violation.

    A photogrammatic analysis could possibly tell you more, if done carefully:
    https://www.metabunk.org/posts/306

    One hint that the planes are not so close is lack of wake vortex effects on the contrails, but since they weren't persistent, it is hard to tell.
    Jay
     
    Last edited by a moderator: Nov 20, 2013
  3. Mick West

    Mick West Administrator Staff Member

    It's pretty much impossible to tell a difference of a few thousand feet from the ground, and certainly not from a low resolution video.

    So long as there's 1000 feet vertically between them, then it's fine, and in fact happens relatively frequently.

    This si what it looks like from the cockpit:



    And here's one with THREE planes crossing the path of another. All perfectly legal and safe: