Okay, I'm flying into LAX tomorrow on United Airlines...I am trying to see how I can get either an short scale electric bass or an acoustic bass either on as a carry-on or how the airline would charge me for checking it. The acoustic bass measures 51 by 18.5 by 6.5 inches, which is over UA's 62 linear inch limit...although the case is shaped as the acoustic bass, not as a rectangle. The short scale acoustic bass is a Gibson SG, dimensions 46, 16, 5 inches at its largest widths. Does anyone know about any rules for UA about carrying on guitars or how exactly they would compute the linear length...since its not a perfect rectangle. For checked items over 62 linear inches it's an extra $100. Thanks!