In theory, such a vehicle could stay aloft for weeks or months.

It must retain the gas well enough to stay aloft for 30 days.

"There is a chance she will now stay aloft long enough for us to beam everyone off."

"I had no idea they could stay aloft that long."

It had been expected to stay aloft perhaps a year.

I could only imagine how hard he had to work just to stay aloft.

They can stay aloft for more than a day.

Powered by the sun, it can stay aloft for 18 hours at most.

It takes the energy to stay aloft from the plants below.

She had no choice, however, but to use the system to stay aloft.