Online Coordination System (OCS)

  • The OCS is an online system that can provide real-time information on slot availability at selected airports including HKIA and allow a registered user to manage its own slot portfolio by requesting new slots or cancelling cleared slots.
  • Please visit the portal of the OCS at for detailed information (including the application procedures for creating an OCS account to become a registered user).

Hints and Tips (Useful notes for HKG OCS Users)

  • OCS for HKIA has been available for GCR handling by GABA operators for flights since S11.
  • Registered users can request new slots or cancel their existing slots by editing records of their slots directly (applicable to those GCR slots cleared by OCS via the same user account). For registration detail, select "How to Apply" under "Information" pull down list at OCS website.
  • OCS will only handle GCR submission, and deletion within 7 calendar days from the day of application. This application window will be extended to 14 days with effect from 1600 UTC on 26 September 2016.
  • OCS does not accept retrospective changes and test / training / demonstration flight in HKG.
  • Application for test / training / demonstration flight at HKIA and HKFIR should be submitted to HKSCO via e-mail ( in IATA SSIM format as per Aeronautical Information Circular (AIC) AIC 03/17.
  • Application for helicopter movement at HKIA should be submitted to HKSCO via e-mail in IATA SSIM format as per AIC 29/19.
  • Any abuse of these procedures may result in rejection of the flight movement at HKIA.

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