West of RAPID CITY are two UNNAMED intersections. (Figure 18)
You may enter and exit the airways system at NAMED intersections if they are part of the
airway. NOBBL is part of the airways represented by the line adjacent to it (Figure 17).
You may NOT enter the airway system at a NAMED intersection if it is NOT part of the airway.
BOWLIN is NOT part of an airway. (Figure 19)
If your desired route of flight crosses an area where an airway does not exist, you are usually
able to fly DIRECT. Again referring to the ATM, flying DIRECT is:
STRAIGHT LINE FLIGHT BETWEEN TWO NAVIGATIONAL AIDS, FIXES,
POINTS OR ANY COMBINATION THEREOF.
In the illustration below (Figure 20), it is permissible to request clearance, to fly:
ALEXANDRIA direct JACKSON
3-12 RADIAL TRACKING AND COURSE CONTROL