UP64K - One way Y-C upgrade, lower 48 USA to Middle East
YC28 - One way Standard Y Award, lower 48 USA to Hawaii on a combined (Standard/Saver) RT award (might be the same for reverse routing)
ZC28 - One way Saver Y Award, Hawaii to lower 48 USA on a combined (Standard/Saver) RT award (might be the same for reverse routing)
XC28 - One way Standard Y Award, Hawaii to lower 48 USA (might be same for reverse routing)