Nah, that's just airliners abusing their monopolies to squees every last dime out of your pocket, the poor shareholders need to survive too, you know.
Its not just trans Atlantic either, it's everywhere. I just booked Mexico Canada and I got the luxury premium of being allowed to take one free carry-on
To be clear, 2°C is not going to significantly affect lift. Planes won't to falling put of the sky on sunny days. Rather, airports and weight limits were designed around historic temperature maximums, and much higher maximum temperatures are showing up much more commonly. Adjusting these limits isn't hard, but airlines are going to cry every step of the way and pass the cost ditectly to passengers.
Increased turbulence and higher winds are also a concern, increasing maintenance costs and travel times, as well as extreme weather shutting down airports more often.
Hold on, over how many lines? How was this estimate made? I demand to know what latitude gets the first line change for a given text. Also how much text you'd need and whether we have a single source that would fit.
The Atlantic widens about 1cm per year. Words contain about 6 characters on average. At 12 points, or 4mm tall, that comes to about 2x6=12mm for an average word, make it 15mm for ease and spaces,
If the ocean gains 15x100=1500mm (150cm) of word-width per second, thats 150x60x60x24x365 ~ 4.7 billion centimeters of word-space per year.
Given that it only moves about 1cm, that's a quick and dirty 4.7 billion lines of text.
At 5mm tall (4mm of text, 1mm whitespace between lines), that comes to 23 million meters. Since the earth is about 40.000km or 40 million meters in circumference, and adding in rounding numbers and suffering tectonic drift numbers, 4.7 billion lines seems about the right order of magnitude.