She flew in this morning on a flight from Dubai, arriving at Karachi International Airport under tight security.

NPR: Benazir Bhutto Returns to Pakistan

At O'Hare, both men reportedly checked their luggage onto a flight bound for Sanaa, which was scheduled to stop at both Washington Dulles International Airport and Dubai.

BBC: Yemenis on US flight held over terror alert

Dubai already has the world's third-busiest international airport, with traffic growing at 20% a year.

ECONOMIST: Aviation

Fueled by Dubai's business, shopping and entertainment, passenger traffic through the Dubai airport is growing at 12% a year, versus an international average of 5%.

FORBES: Even during wartime, a Middle Eastern airline thrived.