Originally Posted by
corporate-wage-slave
I've looked at LHR to NCL and to EDI for travel today, a busy Friday. NCL there is no H available today, there aren't so many services, they're looking quite full and it's now showing Y9 H0 for all services.
So in short, you need to be careful with semi flex. Semi flex in Y is probably OK, but won't be cheap normally, but semi flex at B and below is probably best for mid week, middle of the day travel on less busy services.
This is totally wrong; you don't need to be careful or pay for more expensive fares if you just want to change on the day. As long as it is a semi flex fare - even a (relatively) cheap one - then you can switch on the day to a plane that has one seat available for sale at a full Y price.