It is the travel nightmare currently plaguing thousands of American travelers: your flight out of Midway or Love Field is abruptly delayed, the Southwest app has crashed under the strain of a sudden summer storm, and you are left stranded at the gate staring blankly at a departures board.

But as frustrated passengers find themselves locked out of digital check-ins and rebooking screens, savvy travelers are turning to an old-school savior to rescue their vacations — a direct telephone line to a real human being.

Now, Travel Today can reveal the definitive, 24-hour master hotline for Southwest Airlines: 1-800-435-9792 (cleverly memorized by seasoned flyers as 1-800-I-FLY-SWA).

While the Dallas-born airline boasts an impressive responsiveness rating, dialing blindly during a massive nationwide IT meltdown or a winter freeze can still land you in a grueling telephone queue.

Industry whistleblowers have revealed that timing is absolutely everything when trying to get a customer representative on the line.

If you want to cut through the noise and speak to a Southwest agent in under three minutes, Thursday is officially the best day to call. Conversely, desperate flyers are warned to avoid dialing on Sundays, which data shows is the single busiest day of the week for customer care centers as the weekend travel rush peaks.

For Americans hitting the beaches south of the border, the standard US 1-800 number won't always connect from a local cell tower. Travelers soaking up the sun overseas will need these dedicated local hotlines to reach the carrier:

Experts advise saving these numbers into your smartphone before heading to the TSA checkpoint. When a travel disruption strikes, every second counts — and a quick phone call could mean the difference between claiming the last open seat to Orlando or spending the night on a cold terminal floor.