I believe there are two evening flights to GLA because an aircraft flys GLA-BOH Saturday morning, operates some routes from BOH during Sat/Sun then returns back to Glasgow Sunday evening, hence the odd looking schedule. It does seem odd that BOH-EDI is so often overlooked, I would think if GLA and indeed the rest of the new routes perform well then it would be a logical addition along with daily services to CDG/AMS/DUB.