FNP's picture in post 28 has 4 CFM56s, but isn't a 340 as i) judging by the engines, the wing is too small ii) the wing has vortex generators which the airbus FBW designs don't and iii) that wing has Kruger style LE devices which airbuses don't. It's either a 707 airframe which would make it an E3 or a C135 derivative or a DC8 conversion. The CFMs weren't certified on civil 707s and as the engines have the CFM logo which wouldn't be put on a military aircraft, I reckon it's a DC8.