Word Processing Equipment and airlines

British Airways announces before each flight that "word processing equipment" must be switched off. It's hilarious, I keep picturing someone up there in Posh Bastard Class who's booked an extra couple seats for his Xerox Word Processor and a long-suffering "word-processing-specialist" to operate it. Also, why the hell does Air Canada forbid the use of in-flight "modems and printers" (and how do they reconcile the ban on modems with the fact that they provide hideously expensive in-flight phone service, with modem jacks?)