Boeing lost 84 more orders than it won in the first 11 months of the year.
The warning came four months prior to a Lion Air Max jet crash off the coast of Indonesia killing 189 people.
The Federal Aviation Administration (FAA) said on Friday it seeks to impose a $3.9 million fine on Boeing Co.
Hamilton acknowledged Boeing made some mistakes.
The order replaces United's 53 Boeing 757-200s.
The launch is now targeted for Dec. 19.
The House Transportation Committee said Monday that FAA Administrator Stephen Dickson will testify at a hearing Dec. 11.
The airplane has been grounded since March.
Boeing Co’s head of corporate communications, Anne Toulouse, elected to step down from her role and would retire next year, the world’s largest planemaker said on Friday.
Boeing has settled about half of the lawsuits filed in federal court over the October 2018 crash of a 737 Max jet off the coast of Indonesia.
Boeing is trying to bounce back following the grounding of the 737 Max.
Boeing could soon announce orders worth $5-6 billion.
A shareholder lawsuit filed on Monday accused Boeing Co’s board of doing nothing to investigate the safety of the 737 MAX until the fast-selling plane suffered a second deadly crash in five months.
Turkey's SunExpress announced on Monday it is buying an additional 10 Boeing 737 MAX 8 aircraft, on top of 32 already ordered, endorsing the U.S. planemaker's grounded jet.
The FAA may be involved in the design of a new plane from the outset.
The Ethiopian Airlines CEO was noncommittal over purchasing any more Boeing 737s following a spate of recent crashes.
Boeing expects the Federal Aviation Administration to let U.S. airlines resume using the 737 MAX early next year.
Apple has been responsible for almost half the gains from 27,000 to 28,000.
United has 14 Max jets.
The 737 MAX has been grounded since March.