That was the statement from the firm's Chief Financial Officer Brian West on Wednesday (March 20).
He said Boeing's cash burn in the first quarter could be up to $4.5 billion - higher than planned earlier this year.
It's due to a combination of lower deliveries, lower production volumes at its commercial division, and working capital pressure.
The planemaker also pushed back a company cash-flow goal as it constrains production of its 737 model.
West said it will take longer for Boeing to hit its annual cash flow goal of about $10 billion by 2025 or 2026.
He added Boeing would produce fewer than the maximum 38 737 aircraft allowed each month.
That limit was imposed by the Federal Aviation Administration.
The update comes as manufacturing quality at Boeing and major supplier Spirit AeroSystems faces scrutiny.
In January, a door plug blew off a 737 MAX 9 plane mid-flight.
The door panel that blew off the jet appeared to be missing four key bolts.
That's according to a preliminary report from U.S. investigators.
Both Boeing and Spirit are now engaged in tie-up talks.
