The multi requirement at Netjets is due to the contract with owners. All airlines, that I know of, accept viper time toward the turbine PIC requirement, as was mentioned earlier. BTW, flying vipers is cool, but is in no way a time builder. I've been in the Viper for 7 years with 3 tours in OIF and I have about 1100 hours in it. Funny thing is I have more time than an active duty buddy of mine from IFF who has stayed in the viper. He has just over 900. DoD budget cuts and overmanning have been a pain and they seem to get worse every year.
What unit are you trying to get into?