[рони]

как с помощью jquery cookies

$(function() {
    var city = localStorage.getItem("city"),
        avia = $(".menu-item-mega-parent").find(".avia-menu-text:first");
    city && avia.text(city);
    $(".sub-menu a").click(function(event) {
        event.preventDefault();
        city = $(this).text();
        avia.text(city);
        localStorage.setItem("city", city)
    })
});