Just now found out I can arrive at the airport by train

Because check-in time is 6am I was worried about how I could accomplish such a feat.
Taxi at 5am is fraught with them not turning up. Taxi fare would be at least $60. Long term parking would cost at least $120.
Checked the train timetable, catching the first bus at 5am will see me arrive at terminal 3 by 6am.
A worry lifted.