United Airlines Holdings Inc. warned employees that a jump in coronavirus infections in parts of the South and West is jeopardizing a nascent recovery for U.S. travel. The company’s shares plunged.

The airline has seen a sharp drop in bookings, particularly at its Newark, New Jersey hub, as states in the New York City metro area add new quarantine rules for travelers, United executives told employees Monday in a town hall meeting, according to a person familiar with the presentation.

Bookings at United’s Newark hub were 16% of 2019 levels as of July 1, or about half of what they were several weeks earlier when travel began reviving, said the person, who asked not to be named because the discussions were private. United is watching for signs of a similar drop at its Chicago hub given restrictions the city imposed last week on travelers arriving from more than a dozen states, the person said.

The resurgence of Covid 19 infections across broad sections of the nation may further crimp revenues during what is typically the airline industry’s busiest travel season. Demand had been slowly rising from mid-April, the trough of the downturn based upon daily airport security screening data, and airlines have been restoring flights based on expectations of a continued rebound.

United dropped 6.2% to $33.02 at 2:11 p.m. in New York, the worst performer on the S&P 500 index. United had fallen 60% this year as of the close on Monday.

The Wall Street Journal first reported the employee briefing on Tuesday. A spokesman for Chicago-based United declined to comment on the airline’s bookings.

Layoffs Looming
The grim news on demand reinforces the company’s plan to cut tens of thousands of employees starting Oct. 1 as the pandemic continues to depress airline travel. The company may begin notifying workers -- including as many as 30% of its pilots corps -- as soon as Wednesday.

New York, Connecticut and New Jersey have imposed a 14-day quarantine requirement for travelers from 19 states, many in the South and West, such as Florida and Texas, where infection rates have surged in recent weeks. Several of those states were among the first to reopen businesses in early May, which helped fuel an uptick in new virus infections and hospitalizations.

At least 14 states have adopted two-week quarantine mandates for out-of-state visitors, Raymond James analysts wrote in a July 7 client note, adding that such rules “essentially work on the honor system.”

“While the quarantine measures are questionably enforced (if at all), the hassle and uncertainty have only added to traveler unease,” they wrote.

This article was provided by Bloomberg News.