first-class \first"-class`\, a.
   of the best class; of the highest rank; in the first
   division; of the best quality; first-rate; as, a first-class
   telescope.
   1913 webster

   first-class car or first-class railway carriage, any
      passenger car of the highest regular class, and intended
      for passengers who pay the highest regular rate; --
      distinguished from a second-class car.
      1913 webster
see also:
first-class car first-class railway carriage 

first-class
     adj : of the highest quality; "made an excellent speech"; "the
           school has excellent teachers"; "a first-class mind"
           syn: excellent, fantabulous
     adv : by first-class conveyance; with first-class accommodations;
           "we always travel first class"
see also:
excellent fantabulous