KEY POINTS
  • Boeing sought to update aircraft leasing and appraisal firms in a closed-door meeting on the grounding of the 737 Max.
  • The planes have been grounded since mid-March following two fatal crashes.
  • Regulators have said there is no firm timeline for returning the planes to service.
Boeing 737 MAX airplanes are stored in an area adjacent to Boeing Field, on June 27, 2019 in Seattle, Washington.

Boeing on Monday sought to reassure aircraft financing and leasing firms that it is working "tirelessly" to get its 737 Max planes back in the air after two fatal crashes that have removed its bestselling aircraft from service worldwide during the height of the summer travel season.

In a closed-door meeting at the Harold Pratt House, a mansion on Manhattan's Upper East Side, Boeing executives outlined its planned changes to controversial software that was implicated in the two crashes, as well as updates to pilot training and fielded questions from lessors and others in aviation finance, according to invitations seen by CNBC and participants in the meeting.