how to get from terminal c to terminal a

The sky tram is called "SkyLink" and runs on the outer perimeter of the terminals. It serves all the terminals. SkyLink stations are ACCESSED ONE LEVEL ABOVE THE MAIN CONCOURSE of each terminal via escalator, stairs, or elevator. Each terminal has two SkyLink stations. Look for signs directing you to other concourses. There are also airport and terminal maps on kiosks located throughout the terminals. ALLOW AT LEAST 45 MINUTES TO GET FROM ONE TERMINAL TO ANOTHER. CHECK THE RED DIGITAL SIGNS ABOVE THE TRAIN ENTRANCE DOORS TO MAKE SURE YOU ARE ON THE CORRECT TRAIN. The trams run two directions in a closed loop and the red signs tell you the train to take for the fastest (shortest) trip to your terminal. Either train will get you to your terminal (both travel in a loop) but the trip length can differ substantially. Once on the tram, interior digital signs above the doors and audio speakers will alert you to the next station. Each station serves multiple gates. Exit at your gate.

Bus or sky train....

Skylink for sure

Skylink stops at all terminals. Get off flight, follow signs and get on skylink. Very easy!

you go through a tram called skylink, that can take you from terminal to terminal.