“This is one of the high points when you speak to airline C.E.O.’s,” said Peter Cerda, regional vice president for the Americas of the International Air Transport Association. “What keeps them up at night is exactly this. What their money’s worth today, it might not be worth tomorrow.”

On Friday, Venezuela’s government also put new limits on the dollars it promises to sell citizens traveling abroad, with a cap of $700 per trip to Florida, compared with $2,500 for travel elsewhere in the United States.

“It’s madness,” said Antonio Miglio, 42, a businessman, who flies to Orlando, Fla., every year with his family to go shopping. “The government made this decision because of the economic crisis, but this will only make the crisis worse.”

In Argentina, the pressures have been building for years. Generous social spending after the crisis in 2002, like freezing household electricity rates and making payments to poor families, has widened Argentina’s deficit. The country has been printing money, fueling inflation. The issue has been so polemical that the government has been in a fight for years over how high inflation really is; independent economists say it reached 28 percent in 2013, while officials say it was 10.9 percent.

Argentina’s economy is still expected to grow at 2.8 percent this year, according to the International Monetary Fund, but growth has slowed significantly from recent years, and capital flight has been a longstanding problem. Given that the government has nationalized businesses like YPF, the country’s biggest oil company, some investors have pulled back, and many people here have tried to take their money out of the country.

To prevent that exodus, the authorities have tried to restrict access to foreign currency. Now, with a nearly 20 percent drop in the value of the peso just this week, the government said Friday that it would allow people to buy dollars with greater ease. The economy minister described the shift as a response to “psychosis” in Argentina’s financial markets.

“The government is trying to find a way out of the mess it got into,” said Fausto Spotorno, an economist at Orlando Ferreres y Asociados in Buenos Aires. “But there’s so much more to do, like tackle inflation.”