| By a letter - for example 2 parallel runways 'L' and 'R' - for 3 'L', 'C' and 'R'. |
| By a letter - for example 3 parallel runways 'L' and 'R' and the central has no letter. |
| By a letter for 2 parallel runways. |
| By a number like '0' and '01' for 2 parallel runways. |
EN 