ZGSZ-VHHH/17 minutes.
Albeit not a scheduled service per se, but during last year we used to position our B744ERFs from SZX-HKG (ZGSZ-VHHH, Great Circle distance 24NM).
I personally flew a few of those, the longest one at around lunch time, launched off Rwy 33, speed control and vectors the long way around for the ILS 25R, that took a while, 00:27 air time and 00:55 block time.
The shortest one, middle of the night, airborne off Rwy 15, an immediate right turn to 'SIERA' (IAF) courtesy of Zhuhai App and before even reaching 'SIERA', vectors for ILS 07R, no speed! That took all of 17 minutes in the air and 35 block time!!
Certainly not a record, but close enough and a lot of fun!! Even kept an ACARS printout for my logbook and posterity!!
Last edited by MexCrew; 9th Nov 2011 at 16:26.