Travel companies saw their stocks fall Tuesday as the industry grappled with the attacks in Brussels.
Shares of American Airlines and Delta Air Lines closed about 1.5 percent lower, while hotel operators Starwood Hotels and Marriott International saw their stocks fall 0.4 percent and more than 1.9 percent, respectively. United Continental Holdings, which owns United Airlines, saw its stock drop over 1 percent.
Brussels, Belgium's capital, was hit by a series of deadly explosions that left at killed at least 31 people. One of the explosions took place in Brussels' main airport of Zaventem and another at the Maelbeek metro station. Brussels Airport CEO Arnaud Feist said that all Wednesday flights were later canceled.
The travel industry is trying to reassure customers following the attacks.