Useful metadata about airports.
A data frame with columns:
FAA airport code.
Usual name of the airport.
Location of airport.
Altitude, in feet.
Timezone offset from GMT/UTC.
Daylight savings time zone. A = Standard US DST: starts on the second Sunday of March, ends on the first Sunday of November. U = unknown. N = no dst.
IANA time zone, as determined by GeoNames webservice.