Formats an altitude in feet as a human-readable string with thousands separator. If the altitude is at or above FL180, returns a flight level string instead.
Altitude in feet.
Optional
Optional formatting overrides.
Formatted altitude string such as "3,500 ft" or "FL350".
Formats an altitude in feet as a human-readable string with thousands separator. If the altitude is at or above FL180, returns a flight level string instead.