Skratky a kódy, potrebné na dekódovanie a kódovanie dokumentov, ktoré sú plne v súlade s ICAO (International Civil Aviation Organization) – Dokument 8400 „Skratky a kódy“.
| Skratka / značka | Význam skratky / značky |
| W | West or western longitude |
| W | White |
| W… | Sea-surface temperature (followed by figures in METAR/SPECI) |
| WAAS | Wide area augmentation system |
| WAC | World Aeronautical Chart — ICAO 1:1 000 000 (folio-wed by name/title) |
| WAFC | World area forecast centre |
| WB | Westbound |
| WBAR | Wing bar lights |
| WDI | Wind direction indicator |
| WDSPR | Widespread |
| WED | Wednesday |
| WEF | With effect from or effective from |
| WGS-84 | World Geodetic System — 1984 |
| WI | Within |
| WID | Width |
| WIE | With immediate effect or effective immediately |
| WILCO | Will comply |
| WIND | Wind |
| WINTEM | Forecast upper wind and temperature for aviation |
| WIP | Work in progress |
| WKN | Weaken or weakening |
| WNW | West-north-west |
| WO | Without |
| WPT | Way-point |
| WRNG | Warning |
| WS | Wind shear |
| WSPD | Wind speed |
| WSW | West-south-west |
| WT | Weight |
| WTSPT | Waterspout |
| WWW | Worldwide web |
| WX | Weather |
| X | Cross |
| XBAR | Crossbar (of approach lighting system) |
| XNG | Crossing |
| XS | Atmospherics |
| Y | Yellow |
| YCZ | Yellow caution zone (runway lighting) |
| YR | Your |
| Z | Coordinated Universal Time (in meteorological messages) |