Airport airline and terminal signs

In Philadelphia and in Washington (that is, Dulles), the signs that tell motorists airline information is organized by terminal number, not by airline. In other words, the first sign you see is for terminal A or 1. On that sign is a list of the airlines that arrive and leave from that terminal.

Having this information certainly helps. However, how could this information be improved? Easy--instead of organizing the information by terminal, do so instead by airline. That is, instead of showing a sign for each terminal, have a sign, or signs, on which airlines are listed alphabetically, and then give the associated terminal number for each airline.

Think about it: if you're going to the airport, you probably don't care who else leaves from a terminal. All you really care about is your own airline. If the signs are organized by airline, then motorists won't have to look in multiple paces to find their airline.