Southwest Airlines has faced several distinct grounding events in recent history, primarily driven by technological failures and safety inspections. Most famously, in late 2022, a massive operational "meltdown" led to the grounding of thousands of flights due to an antiquated crew-scheduling software system that could not handle the "re-pairing" of crews after a winter storm. More recently, in early 2026, brief "ground stops" have occurred due to technical glitches in the firewall architecture that disrupted the connection between aircraft and dispatchers. Additionally, like many global carriers, Southwest had to ground its Boeing 737 MAX fleet for nearly two years starting in 2019 following the global safety directives related to the MCAS software. These groundings serve as a critical reminder of the airline industry's reliance on "legacy" IT systems and the extreme caution taken by the FAA to ensure that any discrepancy in flight-critical data results in an immediate cessation of operations until the fault is isolated and resolved.