I live 6 miles from MAN and there is no public transport available thus I use my car (or very occasionally a taxi) and have done for 20 years or so.
I could "construct" a no-car journey which would involve a 1.5 mile walk to the nearest station, train into Manchester City centre and another train back out to the Airport. Depending on the time of day that takes well over an hour and costs £14.90 day return.
Try that 5 times a week and watch your bank balance dwindle...........