Hmm, the last time I definitely flew on a 707 was 38 years ago, an old BA example. Might have flown on another a year or two later but unsure. Last DC-8 was an AC one in 1982.

As far a 707s go, didn't the early ones have turbojets (exhaust looked somewhat like big star-shaped cookie cutters) and later ones have low-bypass turbofans? Same with DC-8s with the last UA examples having been re-engined with CFM56s? Never got to fly in one of those super-stretch DC-8s. Don't think I flew a turbojet-powered version of either.

Last civilian 707s I saw as in ASU around 1995-96. Sad examples rotting away...