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Frustrated with very early boarding of flights - Page 7 ...
www.flyertalk.com › ... › Airline Programs › American AAdvantage
11 Feb 2012 – Of the many times I flew out of LAX/SFO, pax never boarded early....always 40 minutes prior to scheduled departure (due to wide-body aircraft) ...
**45 Minute Boarding Time for Narrow-Body Aircraft on ...‎ - 15 posts - 3 Mar 2012**

And yes, "STD" is scheduled time of departure

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Note added at 13 mins (2012-04-08 06:38:29 GMT)
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Guidebook for conducting airport user surveys - Google Books Result
books.google.com/books?isbn=0309118123...
David C. Biggs, National Research Council (U.S.). Transportation Research Board, Airport Cooperative Research Program - 2009 - Social Science
given gate lounge are generally waiting for the next flight to depart from that gate, ... will generally begin about an hour before the scheduled flight departure time and ... In the case of flights using wide-body aircraft, passengers will often begin ... However, boarding often begins as much as 40 minutes before flight departure.

[PDF]
Operational Safety Instruction
www.boeing.com/commercial/noise/LHR11_OSI_03_11.pdf
File Format: PDF/Adobe Acrobat - Quick View
40 minutes before the scheduled time of departure (STD) for Narrow Body. Aircraft. • 75 minutes before the scheduled time of departure (STD) for Wide Body ...

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Note added at 26 mins (2012-04-08 06:51:28 GMT)
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Thank you so much.