Now Playing: 'This Week': Reflections on Iraq

Now Playing: Syria and Iran Launch Airstrikes on ISIS

Now Playing: Customers Feeling the Pain at the Gas Pump

Now Playing: New concerns about fake reviews on Amazon

Now Playing: Amazon now offering in-car delivery service in 37 cities

Now Playing: Amazon now offering in-car delivery service

Now Playing: Southwest CEO responds to fatal emergency landing

Now Playing: Protesters expected at a Philadelphia Starbucks today

Now Playing: Uber expands into rental cars

Now Playing: Zuckerberg to face 2nd round of questioning on Capitol Hill

Now Playing: Zuckerberg tells lawmakers he's responsible for Facebook privacy failures

Now Playing: What is the jobs report?

Now Playing: Facebook users to learn if their data was shared

Now Playing: Former Chevy engineer and Chevy Trucks celebrate centennial together

Now Playing: Facebook reveals up to 87 million users affected by data scandal

Now Playing: Amazon stock plunges after Trump's tweets

Now Playing: Markets down drop more than 700 points after news of China tariffs, trade war

Now Playing: Amazon stock falls amid report Trump wants to regulate

Now Playing: Apple reveals new affordable iPad model for students, teachers

Now Playing: Facebook stock plunges amid new federal investigation