TLL-BRU connection in PRG. Economy. Each and every flight was delayed +/- an hour. First of all my flight from Tallinn got delayed about 50 minutes because of de-icing. When we arrived in Prague I only had 10 minutes to catch my flight. I only barely made it thanks to not having to pass any security checks anymore. That flight was delayed as well and I arrived in Brussels an hour later than planned. On the way back my flight from Brussels was delayed over an hour so I missed my connection in Prague. So I had to stand in line for another hour to get my tickets exchanged. Of course there were no other direct flight to Tallinn so they gave me one through Helsinki. At least I got to travel in business class because economy was full. Then my flight from Prague was delayed AGAIN and I missed my connection in Helsinki AGAIN. So I had to stand in line once more (another hour) to exchange my tickets wait an hour for the flight to Tallinn which was also (of course) delayed about 50 minutes. In conclusion I spent my entire day in 4 different airports and got to Tallinn 8 hours later than I was supposed to. And with a headache from all the standing in lines in poorly air conditioned airports.