Great stuff Lou. It would seem that the 707-131 was not a big money maker for airlines being it held less passengers that the 300 series.Was the 707-131 used on shorter routes ? It seems in general the key to making a 707 profitable would be to keep it in the air on longer flights being it used so much fuel getting to cruising altitude. But with fuel at 15 cents/gallon back then maybe that really wasn't a consideration?
And what did water injection on the engines accomplish? Was that for addition power on take off? I just remember water injected engines created much dark smoke on take off.