[QUOTE=IluvSQ;14667190]
It may also have some bearing on those flights where there is a surcharge for
some flights on a CRTW, but if you have bought a FRTW the surcharge would not apply.

QUOTE]

To further clarify, as someone sent me a PM:

On certain flights ( SQ EWR/LAX-SIN, AC YYZ-HKG, etc) there are surcharges
ranging from $250 -$700 for these flights if booked on a CRTW fare.
But if you fly these routes in C/J on a FRTW fare, the surcharges do not
apply.