and Barbuda 19 11,646.5 miles (18,743.1 km) Codrington Airport (BBQ) Codrington , Barbuda , Antigua and Barbuda 20 11,636.5 miles (18,727.1 km) Gerald's Airport (MNI) Montserrat , British West Indies . Code formerly used for the destroyed W.H. Bramble (Blackburne) Airport . 21 11,605.0 miles (18,676.4 km) Vance W. Amory International