CHARLOTTE, N.C. (AP) — Workers who clean airplanes, remove trash and help with wheelchairs at Charlotte’s airport, one of the nation’s busiest, went on strike Monday during a busy week of Thanksgiving travel to demand higher wages.

The Service Employees International Union announced the strike in a statement early Monday, saying the workers would demand “an end to poverty wages and respect on the job during the holiday travel season.” The strike was expected to last 24 hours, said union spokesperson Sean Keady.

Employees of ABM and Prospect Airport Services cast ballots Friday to authorize the work stoppage at Charlotte Douglas International Airport, a hub for American Airlines. The two companies contract with American, one of the world’s biggest carriers, to provide services such as cleaning airplane interiors, removing trash and escorting passengers in wheelchairs.