LONDON - On June 22, 2000, Delta and three other airlines founded SkyTeam.

Fast forward 15 years and SkyTeam has grown dramatically, offering a network that eases connections among more than 1,000 destinations around the world.

In honor of SkyTeam's 15th anniversary, here are 15 facts about SkyTeam.

SkyTeam announcement in 2000
1. Along with Delta, the four founding members along were AeroMéxico, Air France  and Korean Air.

2. Today, SkyTeam has 20 members and is the second largest alliance, behind StarAlliance and ahead of Oneworld.

3. SkyTeam’s headquarters are near Amsterdam’s Schiphol airport, home to Delta joint venture partner KLM.

4. The network covers 90 percent of the world’s top aviation markets, with 1,052 destinations.

5. Approximately every five seconds a flight operated by Delta or a SkyTeam member takes off somewhere around the world.

6. SkyTeam airlines carry more than 612 million passengers a year.

7. Delta was the first member to unveil an aircraft in SkyTeam livery, or aircraft paint scheme. That was on March 31, 2009.

8. More than 26 million passengers connect from one member to another each year.

9. Delta developed SkyPriority, a red-carpet priority service to speed Elite Plus, First and Business Class customers through the airport, which is now offered alliance-wide at more than 1,000 airports.

10. SkyTeam is the No. 1 airline alliance in China, with four members from the Greater China Region.

11. There are 629 lounges in SkyTeam’s network.

12. The largest SkyTeam hub is Atlanta, which is served by four SkyTeam members: Delta, Air France, KLM and Korean Air.

13. The 16 top hubs for global transfers are: Atlanta, New York-JFK, Mexico, Amsterdam, Paris CDG, Seoul, Madrid, Guangzhou, Beijing, Shanghai, Los Angeles, Nairobi, Sheremetyevo, Taipei, Jakarta.

14. SkyTeam’s "Go Round the World" pass offers travelers up to 15 stops with travel from 26,000 to 38,000 miles.

15. Delta makes up almost 17 percent of SkyTeam’s global workforce of 481,691 employees 

Related: SkyTeam leaders gather to celebrate milestone.