A380 wake vortex may be a more serious issue than previously understood, according to a Nov. 10 letter from ICAO that states initial tests and modeling undertaken by both European and US authorities have "raised concerns about horizontal and vertical wake turbulence spacing criteria for approach, landing, departure and en-route operations of the A380 relative to other aircraft." According to ICAO, current data analyses indicate A380 wake vortices will descend farther and be significantly ...

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