The Airspace Layers

Imagine you take off from Hayward Executive and climb straight up, like a rocket. Here is every layer of airspace you pass through. While the tower is open, you start in the Hayward Class D. The dashed blue box reads minus 15: from the surface up to, but not including, 1,500 feet MSL. At 1,500 feet, you enter the Oakland Class C. T over 15 means from 1,500 feet up to, but not including, the floor of the Class B.

At 4,000 feet, you enter the San Francisco Class B. 100 over 40 means from 4,000 feet up to 10,000 feet MSL. Above 10,000 feet, you are in Class E, up to, but not including, flight level 180. Class A starts at flight level 180 and goes up to and including flight level 600. The sectional does not show it.

Above flight level 600, it is Class E again. So straight up from Hayward, you pass through Class D, then C, then B, then E, then A, then E again. There is no Class G above this airport.