There was the Lufthansa (just checked sources...not Air India) version of the IGS which involved Cheung Chau direct to Kowloon Reservoir, Sha Tin Valley, Tide Cove, Tolo Channel..then try again.
Can't remember the year but think it was the late 1960's as it was a 707 that scared the living daylights out of Brian Floyd who saw it go over his apartment on the old road into Sha Tin (pre-tunnel).
May have been lining up on the old Sha Tin airstrip...which by that stage was used as a pony club.
Seems it was still used as an airstrip until at least 1961 by the Aux AF Austers.
1961 | 0922 | Flight Archive