As much As i like the 707, to me it always came second-best behind the DC-8. One of the latter alluring features is this pair of nose air scoops. These scoops each had three inlets which provided air for the cabin pressurization/air conditioning systems turbo compressors (the two outer inlets) and to the air-to-air heat exchangers (the central one).
The smart United Airlines “DC-8 Mark IV Jet Mainliner”.