[Get the latest news and updates on the coronavirus in the New York region.]

M.T.A. seeks $4 billion more in federal aid.

New York City’s public transportation system is facing losses of up to $8.5 billion by year’s end as the coronavirus pandemic limits ridership and threatens the system’s other revenues, officials said on Thursday.

The Metropolitan Transportation Authority, which runs the city’s subway, buses and two commuter railroads, said the bleak forecast had prompted it to seek $3.9 billion in federal aid, on top of the $3.8 billion it received last month.

The new financial analysis, which is based on ridership declines of about 95 percent on the subway and the commuter lines, projects up to $5.9 billion in lost fare and toll revenue, and nearly $2 billion in lost tax revenue. The two revenue streams make up 86 percent of the authority’s operating budget.

In previous financial crises, the authority has typically raised fares, cut service or delayed capital projects. But this crisis has plunged the M.T.A. into uncharted territory.

[Coronavirus in New York: A map and the case count.]

Cuomo extends shutdown to May 15 as daily deaths dip.

Gov. Andrew M. Cuomo said on Thursday that he would extend New York State’s shutdown until May 15, in coordination with other states.

Mr. Cuomo said that New York continued to make progress in containing the coronavirus, and he cited encouraging statistics, but he also said that the rate of infection would have to slow much more before he would lift any restrictions.

“What happens after then? I don’t know,” Mr. Cuomo said of the new end date for the restrictions. “We will see depending on what the data shows.”