Airlines are increasingly cracking down on what passengers can take on board, and it’s not just so that they can monetize baggage — although the money is good. A study by IdeaWorks and CarTrawler in 2022 showed an already growing trend in monetizing carry-on baggage. “From global network airlines to low-cost carriers, baggage is the top à la carte performer,” said Jay Sorensen, the report’s author. Many low-cost carriers began charging extra for additional carry-on items several years ago. The larger airlines resisted such measures for some time, but have now begun to adopt fees themselves. Al…