Take a look inside Air Force Two, the 155-foot custom jet plane that vice presidents use to travel the world

The vice president is generally prohibited from flying on "Air Force One," a plane carrying the president.

The president and vice president don't travel together for security reasons.

It's customary for presidents and vice presidents to salute service members as they board and disembark presidential planes.

Service members are required to salute the president as commander in chief, but not the vice president. Still, it's customary for troops to salute vice presidents, as well.

Beginning with the Ford administration in 1975, this DC-9 jet flew as Air Force Two until 2005.

The jet was first used by President Gerald Ford's vice president, Nelson Rockefeller.

It featured a VIP cabin with 10 seats and a main cabin with 32 first-class seats.

The plane was retired from service during the Bush administration in 2005 and put up for auction by the General Services Administration in 2013.

Vice President Al Gore decorated the VIP cabin with family photos.

Gore worked on his acceptance speech for the 2000 Democratic National Convention aboard Air Force Two.

The cabin also featured a clock with different time zone displays.

The clock featured the time in Washington, DC, and whatever destination Air Force Two was bound for.

The updated C-32 plane most commonly used by vice presidents first deployed in 1998.

With a wingspan of nearly 125 feet, each engine features 41,700 pounds of static thrust, according to the Air Force.

Mike Pence's staff decorated Air Force Two for his birthday in 2017.

Staffers celebrated the vice president's birthday with streamers and balloons aboard the jet.

Kamala Harris also celebrated birthdays on the plane.

Harris brought cupcakes and sang "Happy Birthday" to her domestic policy advisor, Kate Childs Graham, in 2021.

Second gentleman Doug Emhoff traveled aboard Air Force Two, as well.

Air Force Two is occasionally used by presidential spouses and Cabinet members.

Emhoff filled out his March Madness basketball bracket en route to Las Vegas in March 2021.

The back of Air Force Two contains 32 business-class seats for members of the press.

Vice presidents and staff occasionally hold informal briefings with reporters known as "press gaggles" aboard Air Force Two.

The press area features TV screens that can play cable news.

The rear cabin also contains a galley, two bathrooms, and closets.