Of all the airlines that serve my area (BOS/PVD) I would put JB as #1...AA near the bottom (right above Spirit). I fly JB maybe six times a year and the most I have ever had a flight changed was by less than an hour...ever. Small sample but I use what works.
Anyone can find isolated instances with ANY present day airline and just about all of them have made the news recently but them main issue I book on is schedule reliability....thus the elimination of AA a long time ago...and my brother-in-law is an AA long haul Captain
I would add Southwest as an equal for reliability...but it drops a notch because I can't have my "Extra Comfort" seat on JB <img src="http://www.traveltalkonline.com/forums/images/graemlins/Grin.gif" alt="" />