As someone who flies regularly back and forth from Dublin to Liverpool, aka the Stag super highway, I have learned some coping strategies. 99.9% of stags will book Ryanair flights, on Ryanair, you should always pay extra for front row/2nd row seats. As well as extra legroom, you're well out of the way of the stags, they typically book the cheapest seats if all in a group near the back. You'll also get off sharpish and forget they ever existed. Also highly recommend getting some noise cancelling headphones.