As has been said on these boards many times talking about the LCC and ULCC airlines, when everything goes well, they're fine. When anything goes wrong, it's impossible to recover. Have you looked into transportation costs from LAL to WDW? And availability? I don't think it's going to be as easy to get an Uber from Lakeland as it is from MCO or Sanford. What is your back up plan if your flight down is cancelled? Your flight home? With legacy airlines that isn't as important to think about because they will get you where they are supposed to, it just may take a while or an extra stop or two. But with the LCC and ULCCs, the next scheduled flight may not be for four days, and may not have space.