The city that boasts the world's tallest building is now home to the world's busiest airport for international passengers too.

Dubai's airport operator released figures Tuesday showing that 70.5 million passengers streamed through the sparkling halls of the Gulf commercial hub's main airport last year. That's a 6 percent increase over the 66.4 million Dubai International handled in 2013.

The rapid growth puts Dubai squarely ahead of London Heathrow for the first time as the world's busiest international air hub. Heathrow reported handled 68.1 million international passengers in 2014.

Hartsfield-Jackson Atlanta International Airport remains the planet's busiest passenger airport overall.

But Dubai International is expanding fast, fueled in large part by the growth of hometown carrier Emirates. Yet another concourse is expected to open there later this year.