A resposta parece ser sim. O documento da FAA que descreve esta regra diz:
TSO C145a and TSO C146a GPS WAAS navigation systems are authorized to be used as the only means of navigation on Federal airways and other published ATS routes in lieu of ground-based navigation aids in Alaska
A legenda do gráfico IFR diz :
To utilize these routes aircraft will need to be equipped with IFR approved Global Navigation Satellite System (GNSS). In Alaska, TSO-145a and 146a equipment is required.
E tanto o TSO C145 e C146 mencionam especificamente o WAAS em seus títulos.