    ISentence ¥ Before. 9/1 it wWas hot unheard -of  lor. a -cornmercial “alicraft to deviate . sightly  Irom ‘itS course;-or.for_ an, FAA -contréller to. lose  adic. contact: with.a pilot. for.a short’ périod. of  tine.    Sentence: 2: ‘Cofvinietciet “‘airine’ can’ change  their route, Wheriever they feel ike’ it                   