At Level 2 airports, the principles governing slot allocation are less stringent; airlines periodically submit proposed schedules to the administrating authority, slightly than historic performance. They're each pill devices with a 7-inch (17.8-centimeter) touch-display screen display. Screen resolution for both devices is 1,024 by 600 pixels. Both gadgets run a personalized version of Google's Android operating system. This will have been electrically comparable to the XT bus; it most definite...