l cannot give you number of leisure vs business people using the airport, but l am an American who travels on business to my head office in the east end of London. l have been flying through SEN since the Aer Lingus link started as it is so much easier and quicker than using LGW, LCY or LHR. Now LCY is great but l generally arrive on Sunday morning and the airport does not open until afternoon on Sundays. So l flt MCO/DUB/SEN its quick and l take the train to Stratford and then the central line tube to my hotel. Plus on the return clearing in DUB through US Customs is so, so easy.