Mid 90's in the USA sat on a US Airways Fokker 100 at Charlotte (I think)- passenger boards with a small trolley with a computer on it (not a laptop) which he eventually manages to stow, sits down and relax. Usual cabin crew announcement "welcome to US airways flight xyz to abc - if your travel plans do not involve flying to abc please let a crew member know" At which point pax with computer, goes pale, gets up and rather hurridly exits the aircraft - opps.