Originally Posted by
geerat
Be careful with the short layovers with the same flight number. I recently took a business class flight from Tokyo narita to Hong Kong visa taipei. As my seat numbers were the same for both legs I received only 40 tier points each way.
That will be because your ticket was for one "leg" (to use the word in this thread): Tokyo to Hong Kong. The fact that the aircraft stopped en route didn't change that.
The options that the OP is looking at will involve a flight from Barcelona to London and then another flight from London to Amsterdam. The tickets for these have to be written as two "legs", with two different flight numbers, so the OP doesn't need to worry about this.