Yeah, I don't think its that realistic for aircraft to lose value once they leave the Manafacturing plant, they will in time, but not a few million off of there overall value the in 2+ mths of NOT being operated!! thats like the car issue, in this case the car would be losing value on the car lot while being made!
BTW, my advice on purchasing cars, and also agreed by everyone else i know, do NOT buy a new car!! Unless of course your rich enough to lose so much money..