Ryanair are releasing their Summer 21 schedule slowly
At the moment everything is pre Covid 2020 , basically nothing has changed except the Dublin flights are only 2 a week as opposed to 4 and Prague is back on sale having moved to a summer only destination
TUI seem to be drip feeding there flights back for next summer but 7 destinations remain off sale
Tenerife
Dalaman
Antalya
Crete
Skiathos
Ibiza
Lanzarote ( only 1 flt at the moment)
There are gaps in the schedule but it looks like there is no 2nd aircraft from Fri - Sun
The same is with Exeter no 2nd aircraft Mon - Thu
Hopefully things will improve but everything is very fluid at the moment