Many airports around the world are increasingly being joined by Metro conveniencing people. Majorly, it is people who probably will use the metro. I do have a sneaking suspicion that the metro would also be a pretty inexpensive good carrier. Two things which I think work in its favor -
a. Security on Airport Metros is higher so that much less hassle. b. Most of these Metros run on specific times so it's easier as it's consistent.
Are there any airports that people know that transport air cargo via metros after being bought by Aircraft ?