Which of the following is NOT a possible content of Field E?

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Field E is used for items that reflect the aircraft’s current status and any immediate operational considerations, not for identifying the aircraft itself. Ground speed fits here because it’s a live performance measure that can change with wind and flight conditions, and it’s something controllers need to know right away. Special condition information is used to flag nonstandard situations or constraints that could affect routing or separation, another time-critical detail. EMRG indicates an emergency or priority situation, which must be communicated instantly to ATC. Aircraft type, by contrast, is a static descriptor of the airplane model and is typically provided in a different data element or section of the message. Since Field E is not meant for identifying the aircraft model, it isn’t a possible content there.