source: function(request, response) {
    var results = $.ui.autocomplete.filter(airports, request.term);
    response(results.slice(0, 10));
}

function airportArray(request, response) {
    var matcher = new RegExp($.ui.autocomplete.escapeRegex(request.term), "i");
    response($.grep(airports, function(value) {
        return matcher.test(value.iata) || matcher.test(value.city) || matcher.test(value.airport);
    }));
}