* This is OpenAIR file is an extended format derived from the original specification. It adds additional fields:

*  - AY: The AY field contains the type and the AC field is now exclusively used to specify the ICAO class of the defined airspace.
*  - TP: The TP field contains a single transponder code (squawk) that must be used inside the airspace. If no transponder code is defined, this field does not exist.
*  - AF: The AF field contains contact frequencies defined for the airspace. If no frequency is defined, this field does not exist.
*  - AG: The AG field contains the ground station call-sign related to the frequency defined for the airspace. If no frequency is defined, this field does not exist.

* This OpenAIR file does contain non-standard AY values. The following list shows all AY types that may be used within this file:
* UNCLASSIFIED, RESTRICTED, DANGER, PROHIBITED, CTR, MCTR, CTA, LTA, UTA, TMZ, RMZ, TMA, TRA, TSA, TFR, FIR, UIR, ADIZ, ATZ, MATZ, AWY, MTR, MRT, ALERT, WARNING, PROTECTED, HTZ, GLIDING_SECTOR, VFR_SECTOR, TRP, TIZ, TIA, MTA, ACC_SECTOR, AERIAL_SPORTING_RECREATIONAL, OVERFLIGHT_RESTRICTION, FIS_SECTOR

* This OpenAIR file does contain non-standard AC values. The following list shows all AC types that may be used within this file:
* A, B, C, D, E, F, G, UNCLASSIFIED

*
* Hours Of Operation
* 24H
*
AC B
AY CTR
AN ZHENGZHOU APPROACH (ZHCCAP03)
AI 67fc5d9f1a516329197ffd20
AF 124.825
AG ZHENGZHOU APPROACH
AL GND
AH 3600m MSL
DP 35:31:21.0000 N 114:15:0.0000 E
DP 34:27:51.9840 N 114:03:37.0080 E
DP 34:11:3.9840 N 113:48:51.9840 E
DP 33:33:42.9840 N 113:01:23.9880 E
DP 33:24:2.9880 N 113:59:39.0120 E
DP 33:17:12.9840 N 114:27:14.0040 E
DP 33:28:54.0120 N 114:44:31.9920 E
DP 33:54:2.0160 N 115:00:20.9880 E
DP 34:33:37.0080 N 114:50:30.9840 E
DP 34:41:29.0040 N 114:45:11.0160 E
DP 35:31:21.0000 N 114:15:0.0000 E