I believe it was something to do with crewing (hours/Sunday schedules), but I can't confirm. To be fair, some of the slots were bad yesterday.
What observers see is a flights(s) leaving 25-30 mins after the EOBT but the initial slots were absolutely horrendous, at one point the Easy Tenerife had a slot 3.5 hours after EOBT.
Mind you, that's not much comfort to the 831 people (both in BRS and abroad) stranded by the Faro, Alicante and Palma cancellations.
If today has been anything like yesterday then I'm in for a busy nightshift tonight.