Get the airway's in and out legs in addition to the exit waypoint.
…preferably in the right order.
Rework ndp_navdata_awy2awy.
Simplify and genericize some stuff.
Store more airway info in a route segment.
A bit o' renaming.
Give more room to the identifier, just in case™
The description need not be so long.
Cosmo.
Simplify and accept NULL indexes.