Spirit Airlines has announced a change in baggage fees, effective for travel on or after Nov. 6, 2012, which will more than double the fee for carry-on bags paid for at the airport gate from $45 to $100 per bag. To avoid the $100 gate check fee, Spirit passengers must ensure that their carry-on bag either fits under the seat in front of them or the carry-on fee for overhead storage use has been paid for in advance of going through airport security. In addition, with bag fees purchased online at time of booking, Spirit?s standard carry-on bag fee will increase from $30 to $35; first bag fee will change from $28 (domestic) / $38 (international) to $30 for both (dom./intl.); and, second bag fee will go from $35 (dom.) / $40 (intl.) to $40 for both (dom./intl.). Similar fee changes were announced for bag fees purchased at online check-in, airport check-in and Spirit?s telephone reservation service. Spirit also announced changes to bag fees for its $9 Fare Club members and group bookings. To find a list of all of Spirit?s baggage and other ancillary fee changes, go to Spirit?s website.