Upgrading a xONEn – what happens if the fares have increased?
The relevant fare rule is
11.(c) Upgrading
So let’s say you purchase a LONE4 and later want to upgrade it to a DONE4
If fares have NOT changed then presumably you simply pay the difference between the DONE4 and LONE4 fares (plus any difference in taxes and surcharges – e.g. the UK APD and BA has different surcharges based on CoS)
If fares HAVE changed, then what is the situation?
Do you pay the difference between the DONE4 fare
at time of purchase and the LONE4 fare paid, or is it the difference between the DONE4 fare
at time of requesting the upgrade and the LONE4 fare paid?