Up to 2 million public sector workers in the UK, including immigration staff, are set to strike tomorrow, November 30, at the stroke of midnight (Wednesday morning).

One of the many things that are expected to be impacted by the strike is air travel. Travelers are being asked by many airlines to avoid travel to/from the UK on Wednesday, and those that are traveling are being warned of long waits, perhaps as long as 12 hours, as immigration desks will be short staffed.

British Airways has announced that they plan to operate on a normal schedule, but are advising travelers to change their tickets to travel today or Thursday. Travelers that simply cancel their tickets will not be offered a refund, according to the airline.

Delta Air Lines has cancelled a number of flights in and out of the UK, 6 at last count, from late this evening and tomorrow. Other international airlines that have cancelled some, but not all of their flights, include Virgin Atlantic, Qantas, Singapore Airlines, Air India, Emirates Airline and Etihad Airways.

The strike is expected to last 24 hours and is a protest of austerity measures that the UK is implementing, including a limit on pay raises through 2014, and reforms of pension plans.