Tokyo, Japan Friday, May 19, 2000 The Charlotte Observer Japanese airlines are warning passengers they will be forcibly restrained for unruly behavior, a crackdown that already has resulted in one disruptive traveler being held in his seat with adhesive tape.  The country's leading airlines reported Thursday that rowdy behavior by passengers more than doubled in 1999.  In addition to violent acts, the 330 reported incidents last year included sexual harassment and drunkenness.