Airports fix
@@ -9,7 +9,7 @@ import altair as alt
from vega_datasets import data
airports = data.airports()
-states = alt.topo_feature(data.us_10m(), feature='states')
+states = alt.topo_feature(data.us_10m.url, feature='states')
# US states background
background = alt.Chart(states).mark_geoshape(
