AirPlus revenue for the first six months of 2013 increased 2.5 percent year over year,

according to half-year financial results posted by parent Lufthansa. AirPlus transactions grew 2.8 percent year over year. "Growth in international business travel stagnated in the first half of 2013, slowing growth at AirPlus," according to Lufthansa. The corporate payment provider posted an €18 million operating result, down €1 million from the same period last year.