Hundreds of flights were canceled or delayed in the United States on Monday as a range of issues appeared to impact two major carriers, American Airlines and Spirit Airlines.

At American, about 13% of the carrier’s scheduled flights — 387 total — had been canceled as of 3 p.m. ET, while another 533, or 18%, were showing as delayed, according to flight-tracking website FlightAware.

The top routes that American Airlines flies are:

1. DFW to CLT (5380+ flights per month)

2. CLT to DFW (4650+ flights per month)

3. ORD to CLT (4470+ flights per month)

4. ORD to DFW (4330+ flights per month)

5. ORD to PHL (4010+ flights per month)

With this new integration, travelers can expect access to more destinations around the world along with additional flight schedule options. What's more, you can now combine and redeem your flyer miles with both carriers, adding greater flexibility. And although the two airlines have formed a new alliance, American Airlines will continue to provide excellent service and flight accommodations. So browse and book your American Airlines reservations here at Expedia as usual.

American Airlines is one of the largest airlines in the world, with flights to over 250 destinations across the United States and around the globe. As an oneworld partner, the airline offers passengers travel on one ticket to over 800 destinations. Cheap American Airlines reservations can be found every day on Expedia, with offers for new discount fares loaded daily.

Domestic American Airline flights span from coast to coast, and include flights to Alaska, Hawaii, and several United States territories as well. Most American flights arrive and depart from one of several hubs located across the country. The largest hub, by far, is the Dallas-Fort Worth International Airport (DFW), which handles several hundred flights every day. Other hubs for American include Chicago's O'Hare International Airport (ORD), Los Angeles International Airport (LAX), Miami International Airport (MIA), and New York City's John F. Kennedy International Airport (JFK). It also considers New York's LaGuardia Airport (LGA) as a focus city, with more flights on the schedule to more destinations than a typical city would have, for the benefit of business travelers looking for tickets into the Big Apple.

American is one of the nation's leading airlines in flights to international destinations. AA Airlines flies to several countries in South America, including Brazil, Colombia, Argentina, and Peru. Through its hub in Dallas, American dominates the travel market to Central America, with service to almost every country between Mexico and Colombia. European service is anchored by American's oneworld partners, with American Airlines flights to the United Kingdom, Germany, Spain, and other countries supplemented with seasonal service to countries like Norway and Sweden. American also serves Asia with flights to Shanghai and Beijing in China; Nagoya, Osaka, and Tokyo in Japan; and several additional nations.

When you need to book a discount reservation on an American Airlines flight, turn to Expedia for deals on flights around the world.

The American Airlines baggage policy allows travelers to pack one personal item and one carry-on item at no additional charge. All carry-on luggage must fit underneath the seat or in the overhead bins. All checked and carry-on baggage must adhere to specific dimensions and weight limitations.

American Airlines baggage fees apply to specific itineraries and reflect the same policies as US Airways. The fees associated with checked bags are determined by the travel destinations, as some locations charge for all checked luggage, while others only charge for the second or additional checked baggage. Additionally, bags exceeding the size or weight guidelines may incur additional baggage fees.

Travelers have access to American Airlines check-in online, so you can avoid the lines at the airport. This online tool allows you to check in between 45 minutes and 24 hours before your domestic flight departure and between 90 minutes and 24 hours before your international flight. Use this convenient feature to confirm your check in and print out your boarding pass before even arriving at the airport.

Continue to use and earn American Airlines Frequent Flyer miles on your reservations as usual. Simply enter your membership information to determine if your reservation qualifies for points. However, due to the merger, now you have the added benefit of earning and redeeming your miles on both American Airline and US Airway flights.

There's nothing worse than arriving at the airport only to find out your flight is re-scheduled. Save yourself the potential hassle and check your American Airlines flight status ahead of time to find out the most current details on departures, arrivals, and even gate information. American Airlines also offers mobile flight notifications, so you can stay up-to-date on your flight details, wherever and whenever.

If I am not able to travel due to COVID-19, can I change my flight to a later date?

For more info about changing your flight with American Airlines with Travelocity, please visit our Customer Service Portal.