Online check-in is available from 24 hours to one hour before departure. All baggage must be checked-in at least one hour before departure. Allegiant recommends that passengers arrive at the airport at least two hours before take-off (check-in desks close 45 minutes before scheduled departure).

Hand luggage: One piece of cabin baggage plus a personal item such as a purse or laptop may be brought on board. There's no weight limit but the dimensions must not exceed 9in H x 14in W x 22in D (23 cm x 35cm x 56cm) and the bag must be able to be stowed under your seat or in the overhead bin. Food items or duty-free merchandise may also be brought onboard.

Checked: There's no free allowance and fees are priced by route. The price of the first checked bag is $19.99 online ($35 at the airport) on most routes. The second piece of luggage also costs $19.99 online ($35 at the airport) on the majority of routes. Third and fourth bags cost $50 online and at the airport.

Excess: The fees for overweight bags 23-32kg (51-70 pounds) is $50. For luggage weighing between 32 and 45kg (71-100 pounds) the fee is $75. Oversized bags (the outside measurements exceed 203cm or 80 inches) is $75.

Varies by aircraft but in general the seat pitch is 76-81cm (30-32in).

Open seating is the system (numbers are assigned at check-in on a first-come, first-served basis) unless passengers have purchased seat assignments (can be done online or at the airport). The fee ranges up to $29 per person each way. Priority boarding may also be purchased for $9.99 per person per flight.

Changes to flight times, dates and names can be made online by logging in to www.allegiantair.com. Fees are levied for these changes - $50 to cancel a flight, for example. No changes or cancellations are permitted within 24 hours of the flight. Purchasing Trip Flex at the time of booking enables passengers to make changes to the date, time and destination without incurring a fee.

Lap infants (15 days to two years) fly free of charge. There's no discount for junior flyers.

There's no discount for senior flyers.

Pets (cats and dogs) are allowed to travel in the cabin with their owners. The fee is $100 each way. There is no fee for service animals.

Instruments must be in a case. A reservation must be made for the instrument at the regular fare and large instruments must be secured in the first window seat aft of a floor–to–ceiling bulkhead. Seats are limited in availability and passengers should contact the airline at the time of booking.

Drinks and snacks are available for purchase on board. Prices range from $1.99 to $12.99. There's no in-flight entertainment on flights.

Allegiant does not have a frequent-flyer scheme.

There’s nothing like heading up in the skies to work up an appetite. Check out the airline’s menu before you fly so you can decide if you need to bring any extras. A list of drinks and snacks available for sale can be found onAllegiant Air's website.

The Sunseeker Guide is on every flight, providing passengers with insider information on the destinations Allegiant serves. The latest issue can be read here.

Allegiant is not a member of any of the big airline alliances. The in-house package holiday seller is Allegiant Vacations, which has arrangements with hotels in Las Vegas, Orlando and Daytona Beach.

Allegiant offers air links to the most in-demand leisure destinations in America including Las Vegas, Los Angeles, Fort Lauderdale, Orlando and Tampa. The airline offers the complete holiday experience - selling flights (all-coach configuration, no First Class), accommodation,  cruises, rental cars and activities.