American Airlines and Southwest Airlines said in a statement on Friday that they have canceled all 737 MAX flights until March next year. The first crash of the 737 MAX aircraft, produced by Boeing Co, took place in March this year which had resulted in a global grounding of the plane. Both the airlines have experienced the impact of the removal of 737 MAX flight from their fleet on their profits as they had to remove over 300 flights per day from schedules. Besides that, the companies have had to reconfigure their growth plans as well. Southwest had earlier canceled 737 MAX flights until February 8. However, now the airline expects the return of the aircraft to service by March 6. It added that the date may again me pushed forward. Planemaker Boeing has aimed to get its aircraft back to service by the end of this year. But it is struggling to get approval from airline regulators from all around the world as they conduct their own examination of the safety of the plane. American Airline said that after the aircraft receives its certification, it would conduct test flights for its team members. It has decided to fly the aircraft for commercial flights by March 5. United Airlines has pushed canceled until January only but is expected to push it further. According to Reuters, the US and European regulators are required to reach a Rockwell Collins facility in Iowa to conduct an audit of documentation provided by Boeing on its software. This comes after regulators remarked the documents as substandard. The planemaker has also agreed to provide revised documentation. Two US officials said that it is very unlikely that the aircraft would be able to fly again by the end of December. Chief executive of the planemaker, Doug Parker, had said two days ago that he was the aircraft would get its approval hopefully in the near future.