Originally Posted by
luxetraveller
The D fare itself is no fee for a change. If I had booked the reservation as a one way, i could have changed for free. But because I booked as part of the round trip with a b fare, I was told the entire reservation defaults to the regulations of the b fare.
That's correct, since you booked it as a round trip. However, there can be drawbacks of booking a trip as two one-ways (even in cases where the price is the same), so neither way is necessarily better than the other. Depends on the situation.