Symbol 6294 from IEC 60417 - Title/Meaning: AIS SAR aircraft Function/description: [To indicate the position of search and rescue in the automated identification system.;The symbol shall be aligned to the reported course over ground (COG).]
Additional information: 
AIS stands for automated identification system, SAR standrds for search and rescue.
For technical details, see IEC 62288.
The graphical symbol for an AIS SAR aircraft shall be drawn with a thin solid outline with the same basic colour as used for target symbols. The symbol shall be oriented in the direction of the COG. The length of the symbol shall be 6 mm.
Own work using: iso.org/obp/graphics/grs/38a56b9b-7185-4a0d-968f-a1af1132678c 200.png
Vectorization:  Mrmw