Southwest Airlines is a popular low-cost carrier based in the United States. The airline offers affordable airfares and a no-frills approach to flying. Customers can make reservations online or by calling the airline's reservations center. Southwest Airlines is known for its friendly customer service and a unique boarding process that allows passengers to choose their own seats based on their boarding group. The airline operates a large fleet of Boeing 737 aircraft and serves over 100 destinations across the United States and internationally. Customers can also sign up for the airline's frequent flyer program, Rapid Rewards, which offers a variety of perks and benefits. Overall, Southwest Airlines is a great option for budget-conscious travelers who want a hassle-free flying experience.