I don’t tweet much anymore, but the experience I’ve had with @AmericanAir has been absolutely terrible and if you’d like to arrive at your destination the on day you book, best look for a different airline.
@USPS is the most inept and poorly ran institution I have ever had to deal with in my entire life. The one job you have is to mail packages... so how to do mess up doing your ONE JOB. Inexplicable complete failure.
Long story short- you’re better off driving your package to the destination, using the pony express, tying your package to an owl, or literally any other way you can think of to get something to someone else- rather than use @USPS and have them fail to do the one task you need.