I can either - go for a train trip to the 2nd largest city in Denmark (Copenhagen to Aarhus) for 230 eur (2 adults + a kid) and it takes almost 3 hours. - take a Ryanair flight to Alicante for 240 eur (2 adults + a kid), flight takes 3.5 hours
The weather will be much better, the food and accommodation cheaper by a long shot (not to mention Spanish cuisine). It’s not even comparable how much more value you get when flying.
My impression is that Air travel to touristic destinations is just too cheap, for a reason. Selling airplane sits for pennies is probably just part of a bigger business. Tourists typically will spend money on services and hotels that could be owned by a sibling company, etc...
In Spain is often discussed how UK tourists can came to Spain for ridiculous prices, while we can't do the same in the opposite direction (or when flying inside the country). Tour-operators altering the market could be the reason for that "magic" IMAO.
Trains are nice in any case (but nobody is armed here, so just copy the system could be more defiant in other places)