Originally Posted by
MSPeconomist
I've been denied earlier KLM intraEU flights at AMS on M fares.
Flight may have been full or you showed a Delta BP?
Otherwise it's no problem and if you show up early enough KLM agents check and ask if you would like to take a earlier flight even up until like 30 minutes before the flight.
2nd options is just do it yourself or let show an agent the 'tariefvoorwaarden' when you pull up your KLM PNR and trip:
Wijzigen na vertrek: Wijzigen na vertrek van de vlucht is kosteloos toegestaan.