90 has one aircon fleet in its perm fleet, while 94 has 2.
however, on weekends, both services use a full aircon fleet.
37 has 2 perm buses on weekdays, both of which are non-aircon.
However, there's supplementary trips on the service which the bus
used is aircon. similar to 90 and 94, 37 uses a full aircon fleet
on weekends
