Now Playing: Hurricane Florence reclassified to a tropical storm

Now Playing: Municipal airport damaged in storm

Now Playing: Winter storm moves east, may impact millions of commutes

Now Playing: Winter storm forces flight delays, cancelations during holiday rush

Now Playing: Christy Turlington Burns on the importance of ‘self-knowledge’

Now Playing: Protests in Alabama after police shoot the wrong suspect in a mall

Now Playing: ‘Ralph Breaks the Internet’ is a box office hit during the Holiday weekend

Now Playing: Refocus on health after the indulgent Thanksgiving meal

Now Playing: Online shoppers gear up for Cyber Monday

Now Playing: Police in India say they are close to recovering the body of American missionary

Now Playing: Historic mission to Mars

Now Playing: New details in the mysterious New Jersey quadruple homicide and mansion fire

Now Playing: Trump wants to keep migrants in Mexico while asylum applications are processed

Now Playing: Snow and other weather conditions cause travel headaches

Now Playing: Black Friday synonymous with markdowns and meltdowns

Now Playing: Boat crashes into ferry terminal

Now Playing: Consumers spent $7.8 billion shopping online during Thanksgiving and Black Friday

Now Playing: Jerome Corsi negotiating plea deal with Mueller

Now Playing: Tijuana mayor declares humanitarian crisis as 5,000 migrants enter town

Now Playing: Trump administration releases new report on climate change