KEY POINTS
  • Costs are piling up for airlines as the 737 Max heads into its eighth month.
  • The planes have been grounded since mid-March after two crashes killed 346 people.
  • Boeing's board stripped CEO Dennis Muilenburg of his chairman role so he can focus on getting the planes back.
Grounded Boeing 737 MAX aircraft are seen parked in an aerial photo at Boeing Field in Seattle, Washington, July 1, 2019.

The worldwide grounding of the Boeing 737 Max, now in its eighth month, is driving up costs for airlines as they cancel thousands more flights into 2020.

American and United this week joined Southwest in removing the planes, grounded since mid-March after two fatal crashes killed 346 people, from their schedules until January.