Now, when it comes to carry-on bags, Spirit has a pretty strict size limit. We're talking 18 x 14 x 8 inches – that's like trying to fit a small cat into a shoebox! On the other hand, Frontier gives you a bit more wiggle room, with a size limit of 24 x 16 x 10 inches. That's more like trying to fit a medium-sized dog into a bathtub – still a challenge, but a bit more manageable!
But here's the thing: both airlines charge for carry-on bags, and the fees can add up quickly. It's like trying to buy a fancy coffee drink – you think it's just a few bucks, but before you know it, you're paying upwards of $10! So, if you're planning to bring a carry-on, make sure to factor in the extra cost.