Southwest Airlines requires its biggest leap however in global service this week when it adds daily flights to Mexico, Belize and Costa Rica from its new $146 million terminal at William P. Hobby Airport.

A nationwide glitch in the Southwest Airlines computer system forced ticket agents at LAX to manually process and hand-write tickets on Sunday, leading to long lines for passengers.

Technical issues are causing delays and long lines Sunday morning for Southwest Airlines passengers. While teams work diligently to enhance the performance of our technology, our airport-based Employees are working with Customers on their individual itineraries. In other cities, passengers took to Twitter to vent their frustrations that flights departed while they waited to check-in.

Southwest Airlines said about 100 flights (out of 3,600) across the country had been impacted by short delays by 9 a.m. MDT.