HMV's on the 90's are running three times the price of an 88...don't know why but that's the number I was given. The idea is to put 12 90's in the desert with lower times...pull them out to replace 88's as they go bye-bye. I, honestly, don't see the 90's being around more than the next 5-6 years. Hate to see her go....flew her out of DFW and she has a special place in my heart...