Banning drunken hen party groups may be a good first start. A quick search came up with this drunken group of scousers -
http://www.dailymail.co.uk/news/article-4739320/Passengers-CHEER-British-hen-party-forced-flight.html
And, not to be outdone, a group of Scots -
https://www.thescottishsun.co.uk/news/scottish-news/1139847/hen-party-hen-do-glasgow-tenerife-jet2-drunk-flight/
bkmk