Re: drop down oxygen.....weren't the masks behind a flap in the backs of the seats? Or was that a later version of the -500's? I do have a soft spot for them as it was my first aircraft type I flew commercially. The horredously complicated "first checks " and the convaluted APU and engine starting technique. I couldn't believe that Boeing just had a single APU ON/OFF switch.It did marvellous single channel CAT3 Autolands (for its time) "Prime Land , Land and Glide, Flags Clear" ring a bell anybody?