Altitudes with extra character

FlightAware General
1

From the ASDI feed, there occasionally is an extra character tacked onto the altitude (usually ‘C’ or ‘T’). Not all the messages have altitudes like this.

Here is an example:


<asdiMessage sourceFacility="KZJX" sourceTimeStamp="2008-07-11T20:05:27.0Z">
  <trackInformation>
   <nxcm:aircraftId>TN515FX</nxcm:aircraftId>
   <nxcm:computerId>
    <nxce:idNumber>278</nxce:idNumber>
   </nxcm:computerId>
   <nxcm:speed>459</nxcm:speed>
   <nxcm:reportedAltitude>
    <nxce:assignedAltitude>
     <nxce:simpleAltitude>430C</nxce:simpleAltitude>
    </nxce:assignedAltitude>
   </nxcm:reportedAltitude>
   <nxcm:position>
    <nxce:latitude>
     <nxce:latitudeDMS degrees="32" minutes="15" seconds="53" direction="NORTH" />
    </nxce:latitude>
    <nxce:longitude>
     <nxce:longitudeDMS degrees="082" minutes="47" seconds="39" direction="WEST" />
    </nxce:longitude>
   </nxcm:position>
  </trackInformation>
 </asdiMessage>

What does the extra character mean?

2

I think you’d be better off using FlightXML.