I just picked up a pair of Ecco's lace ups but I have read they have to be slip-ons. These are the shoes and company site says airport friendly but then again I though a pair of rubber soled Bostonians I have was also metal free, but I was wrong.

Helsinki Bike Toe Tie | Mens Dress Shoes | ECCO USA

Hopefully they will get me through security without having to take them off.