Allegiant supports our U.S. active and reserve duty military and military veterans by offering select free benefits. The Allegiant Honors program provides several benefits to current U.S. service ...

Matthew Van Dorne hadn't heard about Allegiant Air's new fee for carry-on luggage as he waited Tuesday to board a flight to Allentown, Pa., from St. Petersburg.

Spirit tied for 59th place in the study and Allegiant finished 61st out of the 62 largest airlines in the world based on departures.

Here's how many pieces of luggage, bags, carry-ons, and personal items you can bring on these US domestic airlines and how much it'll cost you.

Spirit, Frontier and Allegiant charge for carry-on bags, don't offer free advance seat assignments and make you buy your own soft drinks.

While most airlines have similar carry-on size guidelines, there are often minor differences. Some carriers are also stricter about overweight luggage, which can include carry-ons.

Airline Carry-on Luggage Size Restrictions: What You Need to Know Here's your cheat sheet for carry-on size limits.

Allegiant Airlines Allegiant permits one carry-on luggage up to 22 x 14 x 9 inches and must fit in the overhead compartment.

Allegiant, Frontier and Sun Country (along with Spirit Airlines, which I didn't fly last week) all use this "unbundled" business model. The base fare is very low, then you add on fees for items ...