1 int_pt = "tas"
2 char_pt = "ftyp"
3 string_pt = "adep" | "ades" | "rwy" | "atyp" | "copx"
4 | "copn" | "frul" | "rfl" | "travel_type"
5 string_array_pt = "route"
6 char_array_pt = "equip"