Wore Mack Titan Q's before. Currently rocking it in blundstones.
The Titans where a throwback from my days on the darwin ramp. Extremely comfortable to wear, held up great on the hot tarmac stepping in all manner of crap, composite toe so I didn't set off the scanners in security and best of all they were flexible around the toes. I've worn some boots that were just too stiff to operate the toe brakes with.