Airbus. And regardless of the inadequacies of maintenance on the ground, or the breakdown in air traffic control both domestically and abroad...the point is that whether from bottom up, or top down, commercial aviation is NOT in good shape and that includes the corporate leadership at Boeing being in among the worst shape of all.
And you keep dodging the point: THIS INCIDENT IS A MAINTENANCE PROBLEM at United. BTW, you should listen to the ATC conversation: excellent example of calm professionalism from both aircrew and ATC.