Or if the person your chucking out the window is anyway Mil related its not to hard to get there remains chucked out of the Lanc or a nimbrod. I organised a family of one of the ladys who used to ferry spitfires to contact
the RAF and they were treated like VIP's by all accounts.
Best scatter of ashes I saw was on Otterburn ranges when several sneaky and down right dodgy looking staff officers came up to a gun and the SMIG dissappeared charge 2 was loaded ashes on top and the cart rammed.
Six rounds fire for effect and the chap was spread over otterburn by a FH70.
Lots of muttering by old chaps along the lines of "the bugger would like that its about the only range rule he had left to break"
All the DIY scattering of ashes I have heard storys about have ended up either the ashes become a permanet fixture in the aircraft or the whole lot goes overboard and the pilot ends up reading news papers for a week to see if some rambler has been brained.