If an arrival time moves later, review the revised flight information first and the airport rail timetable second. The airport app provides real-time flight information, while the published airport-rail timetable can change without prior notice. Then check the precise rail times at the relevant station on the day of the journey.
Check the revised flight information
A later arrival can change the rest of the journey, so an earlier itinerary should not be treated as current. The first practical check is the latest real-time flight information in the airport app. The available material does not specify when a revised arrival time will appear, so no update time should be assumed.
Check the airport rail timetable
Airport rail timetable information can change without prior notice. After checking the revised flight information, review the timetable for the travel date and check the precise times at the airport rail station. The published guidance specifically advises checking those times on the day of the journey.
The flight update and rail timetable are separate checks: confirming the arrival time does not confirm the current rail times.
Confirm what the sources do not cover
The available material does not specify whether a later arrival affects a booking, ticket, fare, refund, or connection arrangement, and it does not state a required transfer interval. Those points remain unverified and must be confirmed independently against the applicable current terms before the traveller relies on them.