▁because ▁a ▁vast ▁res er voir ▁of ▁eager ▁and ▁qualified ▁young ▁men ▁that ▁volunte ered ▁for ▁the ▁Air ▁Service , ▁and ▁also ▁because ▁this ▁phase ▁did ▁not ▁require ▁flight ▁instruction ▁or ▁aircraft . ▁ ▁The ▁Sign al ▁Corps ▁sent ▁several ▁represent atives ▁to ▁the ▁University ▁of ▁Toronto ▁School ▁of ▁Military ▁Aer onaut ics , ▁where ▁they ▁attended ▁classes , ▁listened ▁to ▁reports ▁from ▁the ▁war ▁zone , ▁and ▁gathered ▁instruction al ▁materials ▁and ▁reg ulations ▁used ▁at ▁the ▁school . ▁The ▁Canad ians ▁en rolled ▁a ▁new ▁class ▁every ▁week , ▁gradu ating ▁students ▁in ▁six ▁weeks ' ▁time . ▁Success ful ▁ground - school ▁gradu ates ▁proceeded ▁to ▁flying ▁school . ▁The ▁system ▁served ▁to ▁we ed ▁out ▁some ▁un fit ▁or ▁in comp et ent ▁students ▁early , ▁conser ving ▁time ▁and ▁instruction al ▁and ▁equipment ▁resources . ▁The ▁American ▁committee ▁decided ▁to ▁adopt ▁the ▁Canadian ▁program ▁in ▁its ▁entire ty , ▁only ▁length ening ▁the ▁course ▁to ▁eight ▁weeks ▁( l ater ▁extending ▁it ▁to ▁ten ▁weeks , ▁then ▁to ▁twelve ), ▁using ▁existing ▁American ▁univers ities ▁for ▁instruction . ▁▁ ▁During ▁World ▁War ▁I , ▁approximately ▁ 2 3 , 0 0 0 ▁volunte ers ▁entered ▁flying ▁cad et ▁training . ▁E ight ▁private ▁and ▁state ▁univers ities ▁offered ▁pre fl ight ▁( ground ▁school ) ▁training . ▁ ▁This ▁was ▁conducted ▁at : ▁ ▁Pr inc eton ▁University , ▁New ▁Jersey ▁ ▁University ▁of ▁Texas ▁ ▁Corn ell ▁University , ▁New ▁York ▁ ▁University ▁of ▁California ▁ ▁University