BERLIN—Lufthansa is putting on more flights for business travelers in September and October, the chief executive of the German airline told Reuters on Wednesday. “We are now seeing very clearly that business travelers are coming back,” Carsten Spohr said, adding Lufthansa had increased capacity on domestic flights by 30 percent in September and would increase it by another 15 percent in October. Lufthansa will reintroduce the hourly frequency of flights between Frankfurt and Hamburg and Frankfurt and Berlin in the mornings and evenings, times popular with business travelers. “In Europe, we are already flying 60 percent of our program again,” Spohr said. Business travel is seen only returning gradually after it collapsed during the coronavirus pandemic as many companies have slashed their travel budgets and have got used to holding meetings online. Speaking on the sidelines of a conference in Berlin, Spohr said the air cargo business was booming. “In …