The average speed of the MRT is 50kmh while the average for plane is 200kmh whether landing or take off.
The frequency between planes landing is one minute while the frequency between trains is 3 minutes during peak hours.
MRTs while in motion without breakdown within 100 days is an achievement.
Planes without breakdown while in motion for the last 100 months is pure magic.
Just wait till the first SQ plane crashes at Changi. MRT breakdowns will become just stale appetizers.