Could you please a data field for the altitude and a field for altitude source (GNSS or Barometric).
please read the ITU document M.1371-5 section 3.7, table 59 (page 118) . https://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.1371-5-201402-I!!PDF-E.pdf
Also could you add a different map icon for aircraft so they are easier to pick out from the tugs and other vessels that are light blue?
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