Delta Air Lines Inc. will discontinue separate first and business classes on international flights, opting for a single premium service section at the front of its planes.

The plan will take effect this winter on transoceanic flights and flights to Brazil. Seats in the new section will be priced about the same as current business fares, Delta said Wednesday.Atlanta-based Delta said it will spend more than $125 million to refit its 57 planes that fly internationally. Rivals such as Continental Airlines Inc. and Trans World Airlines Inc. have already combined the two services.

The combined-service strategy is aimed at helping carriers lure more business travelers.

A Delta spokeswoman said demand for business-class seats on international flights is seven times higher than for first class.