Police have arrested a 47-year-old professor who was travelling on Delhi-Mumbai flight for allegedly sexually harassing a woman doctor on the flight sitting next to him.According to the official information, the 24-year-old woman doctor was sitting next to the accused when the flight took off at around 5.30 pm from Delhi. The incident happened on Wednesday. The sources also said that an argument broke out between both the passengers when the crew members intervened. Thereafter the woman filed a complaint against the accused for sexual harassment at the nearest police station, after which police made the arrest. However, later he was released on bail by the court, adding that the probe will resume.