Location identifiers in red (i.e., KZCA, KZCH, KZCL) shall not be filed anywhere other than in Fields 3b/c of a U.S. domestic ICAO flight planning message. The location identifiers below will be included in Acknowledgement (ACK) and Rejection (REJ) messages to indicate the source of the message.
| ARTCC Name | Field 3b/c Four-letter Location Identifier | Notes |
|---|---|---|
| Albuquerque (ZAB) | KZCA | Requires border coordination – will change to KZAB on January 26, 2009 |
| Chicago (ZAU) | KZAU | |
| Boston (ZBW) | KZBW | |
| Washington (ZDC) | KZDC | |
| Denver (ZDV) | KZDV | |
| Fort Worth (ZFW) | KZFW | |
| Houston (ZHU) | KZCH | Requires border coordination – will change to KZHU on January 26, 2009 |
| Indianapolis (ZID) | KZID | |
| Jacksonville (ZJX) | KZJX | |
| Kansas City (ZKC) | KZKC | |
| Los Angeles (ZLA) | KZCL | Requires border coordination – will change to KZLA on January 26, 2009 |
| Salt Lake (ZLC) | KZLC | |
| Miami (ZMA) | KZMA | |
| Memphis (ZME) | KZME | |
| Minneapolis (ZMP) | KZMP | |
| New York (ZNY) | KZNY | |
| Oakland (ZOA) | KZOA | |
| Cleveland (ZOB) | KZOB | |
| Seattle (ZSE) | KZSE | |
| Atlanta (ZTL) | KZTL |
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