BERLIN (AP) — Germany's flagship airline Lufthansa is warning of inconveniences for passengers and possible delays Thursday in an ongoing dispute with its catering service employees.

The Ver.di union called for a 24-hour warning strike for the caterers in Frankfurt and Munich as it seeks wage assurances from Lufthansa as it prepares to sell its LSG Sky Chefs subsidiary to Switzerland's Gategroup.

A court issued an injunction late Wednesday against the strike, Germany's dpa news agency reported, but Ver.di was expected to appeal that and it wasn't clear how the labor stoppage would proceed. Ver.di couldn't immediately be reached for comment.

Regardless, Lufthansa has set up temporary catering stations in the two airports to offer customers free snacks and drinks, and says it will reimburse costs for customers purchasing their own meals and beverages “up to a reasonable level.”

It cautioned ahead of time that in “exceptional cases” flights may be canceled and urged passengers to check the status of their bookings online.

Ver.di says LSG Sky Chefs has 35,500 employees and produces around 700 million meals for 300 airlines annually.