Upgrade from C to F with on business
I would like to book a business class ticket with an upgrade with onbusiness points. Which class do I have to book for this upgrade?
I called BA and they told me only D class is available. When I try to book this online I get normal I class ticket prices from London. But when I start my ticket in Amsterdam or Dusseldorf I get prices like 8000-9000 euro + points (more expensive then regular paid first class).