onecoolmama --
if it's any help to you, we flew down from detroit to orlando when my son was 6 weeks old and he was just fine...
as for the question:
we used to be from suburban detroit (oakland county - the burb that has "hills" in its name

)
before i married, when my parents, my sister and I first started to go to WDW (in 1973), we always drove down (two days, stopping somewhere in georgia)...
however my DH won't consider driving, so over the past 26 years, we've only flown.....despite the fact that i'm terrified of flying....(really more like terrified of crashing).....
we now live overseas (waving to the other expat who posted

)...
we have to endure a 12 hour non-stop flight to new york.....then changing planes to catch a flight from NY to MCO.....with the travel time to the airport, security time at the airport, plane change time, etc., it's a 24 hour trip.....
to the person who's flying from amsterdam to london to orlando.....we once flew directly from amsterdam to orlando (KLM subsidiary)....is that flight no longer available?....i hate flying through london (unless i get to stop and spend some time there)....
anyway....my DD and i would much prefer to drive from NY to Orlando (even moreso now after 9-11), but DH and DS won't hear of it.....too bad.....i really really really really really hate flying.....
