If you fly near Class B airspace, every time the new VFR sectional comes out, look at the dimensions of the Bravo tiers carefully. The floor of the Bravo is at the surface over the primary airport ...

and their notations on the sectional chart. Airspace guide: this is a comprehensive guide to reading a VFR sectional chart and interpreting its symbology, with an emphasis on airspace. VFR sectional ...