Southwest Airlines

Flight 426 from STL to Lax May 1 was cancelled on April 30 at 115pm .. called southwest on hold for an hour they stated it was cancelled do to weather but other flights were going out at the same time going the same directions.. makes me think this was cancelled because all the MAX planes are grounded this cancellation was not do to weather. This was very inconvenient since I have to be at work in the am at a hospital. Very disappointed in Southwest