Definition

Contraction

Usage

Yards

YD

ICAO

yellow caution zone (runway lighting)

YCZ

ICAO

Yellowstone

YLSTN

NWS

Yes (affirmative)

YES

ICAO

yesterday

YDA

GEN

you are authorized

URAUZ

GEN

your

YR

ICAO

your message

YMSG

GEN

your message date

YMSGD

GEN

your recommendation is requested

URIZR

GEN

Yukon

YKN

NWS

Yukon Standard Time (time groups only)

Y

NWS