(Refer to figure 27.) What aircraft equipment code should be entered in block 3 of the flight plan?

(Refer to figure 91.) What is the function of the Great Falls RCO (Yellowstone vicinity)?

(Refer to figure 89.) What is the ARTCC discrete frequency at the COP on V208 southwest bound from HVE to PGA VOR/DME?

What is the recommended procedure for transitioning from VFR to IFR on a composite flight plan?