GAZMO,
If one departs SEN at 0830 and, based on a one hour block time, one arrives PAR/BRU/AMS at 1030, one then can't depart PAR/BRU/AMS at 1000 because the aircraft hasn't yet arrived but if one departs PAR/BRU/AMS at 1100, and based on a one hour block time, one arrives SEN at 1100.
Question is ..... who the hell wants to depart the continent just before lunch to arrive BFS or wherever just as the business day is closing?