<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> Spirit Airlines encourages its passengers to check in online 24 hours before to their departure. Long airport queues can be avoided and time can be saved by using this method. <a href="https://allairportsterminals.com/spirit-airlines/spirit-airlines-bos-terminal-boston-logan-international-airport/">What Terminal is Spirit Airlines at BOS</a> ? Passengers must get familiar with baggage policies because Spirit's "bare fare" model charges costs for both checked and carry-on items.