(a) What amount has been spent on slip crews for each specified aircraft operated by the SA Air Force's Squadron 21 (VIP Squadron) (i) in the (aa) 2009-10, (bb) 2010-11 and (cc) 2011-12 financial years and (ii) since 1 April 2012 and (b) what (i) was the cost of the specified ferry flights and (ii) is the breakdown of the expenditure (aa) in the (aaa) 2009-10, (bbb) 2010-l1 and (ccc) 2011-12 financial years and (bb) since 1 April 2012?