[upthesaukee]

The Airport Identifier for the Alton Ice Airport is B18, or KB18. It has two runways, runway 1 and runway 19. Runway 1 is the runway that heads out the bay, and runway 19 is the runway that heads from the bay to Gillen Marine.

Using Laconia airport as an example of another airport. It's identifier is LCI, or KLCI. Its runways are runway 8, which runs from Lily Pond to Patricks, and runway 24, which runs from Patricks to Lily pond.

The identifier only identifies the airport itself, B18 for Alton ice runway, LCI for Laconia, MHT for Manchester-Boston Regional, PSM for Pease, etc..

The runways at each airport will be reciprocal number, 180 degrees different for each runway. Manchester, for instance, had multiple runways, as does Logan airport in Boston, to accommodate the airplanes as much as possible to land and depart into the wind.

The runways for airports are designated by the magnetic heading of the runway, taking the magnetic deviation into consideration. When I worked down in Louisiana, we had 3 airports that were no more than 9 miles apart, and all three had runways 14/32. If we were helping an aircraft to an airport, we would tell him to fly a particular heading for "vectors to runway 14 at Downtown airport", or to Shreveport Regional airport, or to Barksdale AFB.

By the way, the K prefix indicates that the airport is a US airport. The identifier for Alton is B18, but to further delineate it, it can also be shown as KB18, Alton airport in the USA. Hope that helps.