# What would be the designation for 4 parallel runways? [duplicate]

If an airport were to have 4 parallel runways (ex if KSEA added another one), what would the designations be. Would it be 34L, CL, CR, and L? I know in Orlando they are separated by the terminals, and thus quite far apart, and they're numbered 17 and 17 and 18, for example. But if they were right next to each other, would that make a difference? Would the two-number system still be used there?

## marked as duplicate by ymb1, Jay Carr, J Walters, fooot, UnrecognizedFallingObjectSep 16 '16 at 4:12

• I disagree with the close votes. The previous question is a very general numbering question and does nothing to get an answer for this question on a specific case. – Notts90 Sep 16 '16 at 8:12
• @Robert Yes it does. This question is in fact explicitly answered there. – voretaq7 Sep 16 '16 at 15:49
• @voretaq7 I missed that part, apologies. Easily missed with so many long answers. – Notts90 Sep 16 '16 at 16:00
• @Robert Yup, it's easy to miss - that's why I linked to it :) – voretaq7 Sep 16 '16 at 16:07

Airports can have a left, center and right runways. Memphis (KMEM) is a good example. Airports with four or more parallel runways are left and right with the numbers off by one. Los Angeles (KLAX) and Chicago (KORD) are good examples of such an arrangement.

• Roissy Charles-de-Gaulle (LFPG) also uses the same strategy in Paris, with runways 9L/9R/8L/8R – Matt Sep 16 '16 at 10:11
• KATL has six parallel runways – TomMcW Sep 16 '16 at 19:01
• @TomMcW where? I only see 5. – lightbord Sep 16 '16 at 19:41
• @lightbord Sorry, you're right. There's only 5. I was thinking it was 6 – TomMcW Sep 16 '16 at 20:22
• The 6th one is a little further south. It's only used by the unicorns, though, so it's not on most charts. :) – FreeMan Sep 16 '16 at 20:25