By Jeanne Bonner, Tami Luhby, Maureen O’Hare, CNN

Editor’s note: CNN’s John Fritze, Camila DeChalus and Annie Grayer contributed to this report.

(CNN) — If US congressional lawmakers fail to agree on a spending package for the new fiscal year, which starts October 1, that could trigger a federal government shutdown.

And that could mean significant travel disruptions for travelers in the US and for visitors from overseas. Impacts could be felt in longer airport lines, muddled itineraries and US National Park closures. In addition, big losses in tourism revenue could have significant repercussions for the US travel industry.

While many airport employees, including air traffic controllers, are required to show up for work (as they are categorized as essential), they would do so without pa

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