Airbus, or airlines?
Doesn't matter whether the hardware was made by Boeing or Airbus or Canadair or Bombardier or whatever ... the owner/operator is responsible for maintenance.
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.