| EUROCONTROL |
| XCONF |  Delete CONFlict
|
| XCOORD | Cancel Co-ordination
|
| XCOP | Exit Co-ordination Point
|
| XCOR | Cancel Correlation
|
| XECM | Cancel Executive Controller Message
|
| XEU | European Currency Unit (ECU)
|
| XEXPLT | Cancel Extrapolation
|
| XFDM | Cancel FDM
|
| XFL | Exit Flight Level * (from a sector or volume of airspace)
|
| XFRQ | Cancel FreQuency message
|
| XGEO | Cancel GEO
|
| XHOLD | Cancel Hold
|
| XIFL | Cancel Intermediate Flight Level
|
| XIN | Crossing intentions
|
| XIN | Military Crossing Intention Notification Message
|
| XMET | Cancel METAR
|
| XMT | Excluding (Messager)
|
| XNSSR | Exit NSSR
|
| XOFF/PDR | Cancel Off Predetermined Route
|
| XPLN | Cancel Plan
|
| XPNDR | Transponder *
|
| XPT | Exit Point of a sector (ODID)
|
| XQDM | Cancel QDM
|
| XRA | Crossing Request Answer (SEROS / MADAP)
|
| XRQ | Airspace Crossing Request Message (Airspace Crossing Dialogue)
|
| XSFL | Cancel Supplementary Flight Level
|
| XSSR | Exit SSR
|
| XSSRBRIGH | Cancel SSR highlight
|
| XSTAT | Cancel Statistics
|
| XTDCP | Cancel Test Display Control Panel
|
| XTEDD | Cancel Test Electronic Data Display
|
| XTK | Cross Track Distance *
|
| XTRK | Cross Track Error *
|
| XTRK | Cancel Track
|
| XTT | Across Track Tolerance
|
| IFATCA |
| X | X channels (TACAN)
|
| X | X Windows (X11)
|
| X11 | Statistical Seasonal Variations
|
| X11 | X Windows (X) - a Standard UNIX GUI environment
|
| X25 | CCITT Recommendation number 25
|
| X25 | Public Packet Switched 128 Bytes @ <- 64K
|
| X400 | EMail specification
|
| X500 | Directory Service Standard
|
| X509 | Encryption Protocol
|
| XA | eXtended Architecture(CD´s)
|
| XAP | Crossing Alternate Proposal Message
|
| XASM | Cancel Assume
|
| XASP | Extended AIRCOM Service Processor
|
| XB | Crossbar
|
| XBAR | Crossbar of Approach Lighting System
|
aero glossary
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