ATC question. We were flying to Mexico on WestJet and at some point the plane did a banking turn and then shortly afterwards I looked out the window to see another large plane (737 size) scoot just underneath us at about a 30 degree closure angle. It seemed really close by, much closer than I thought was allowed. Closure speed was too fast to notice the tail colours, but I could easily see the individual windows. Is this common?
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