"I think we need to remember that we have perhaps a brief, but very hard stretch, ahead of us" without a widely available Covid-19 vaccine, Gottlieb told CNBC.
AMC, Cinemark, Marcus Theaters and IMAX stocks rallied Monday after trial data indicated Pfizer and BioNTech's Covid-19 vaccine is more than 90% effective.
The European Union will slap tariffs on up to $4 billion worth of U.S. products Monday, after what it described as a "lack of progress" on resolving a long-standing dispute over aircraft subsidies.
As travel demand slowly recovers, the industry may have some "leeway" to prepare for another round of restrictions, Chantico Global CEO Gina Sanchez said.
Biden will not be sworn into office until Jan. 20, when epidemiologists and medical experts say the country could be in a dire situation with the pandemic.