Ken Burgess is in reflective mood – and for good reason. When the cargo building opened at Dublin Airport in 1968, the top floor was brimming with around a dozen cargo agents. Now, KB Clearances, a customs clearance specialist that he set up 23 years ago, is the only one left. And even his own company is changing. A week ago, Burgess signed a deal to sell the company to the Doyle Shipping Group. The transaction will see Burgess exit the company but family ties will remain – two daughters are working with KB Clearances while a granddaughter is working…