Many pilots with only the minimum training you get these days wouldn't understand the details of what he is saying all of which is correct. When a plane has ICE on it the stalled speed can be way above what it is normally and drag , control, weight and visibility are affected as well.. Jet aircraft use engine heat (Bleed air) so can deice well but can't climb as fast and range as far with icing on. At cruise levels with Cirrus clouds there is no icing issues except fuel ice relating to fuel temps.. Nev