The fastest way to travel to KLIA. The best thing about KLIA Ekspres is, you can check in your luggage at KL Sentral Station if you are flying with Malaysia Airlines or Batik Air. Just go to the check-in counter inside the station, have your luggage scanned, and get your boarding pass right at the counter. Your luggage will be directly sent to the plane. (The check in counters open at 6 AM and the cut-off time is 2 hours before departure if I am not mistaken.) Definitely recommended for a hassle-free check-in experience.