Off-topic, but the link to the crew costs - I can't find my IATA link, but this should help, and it's closer to the 7.5-8% mark for tech crew, including training which can be amortised also for direct operating costs.
Doganis, Rigas 2012, Flying Off Course: The Economics of International Airlines, 3rd edn, Taylor and Francis, Hoboken, ebook:ISBN 9780203995266, pp64-144
ICAO 2000, Base-line Aircraft Operating Costs,<http://www.icao.int/Meetings/AMC/MA/2001/Allpirg4/wp28app.pdf>
The latter is quite outdated.
Last edited by romeocharlie; 1st Jun 2015 at 03:56.
Reason: More info..