Shuttle America
It fed United Airlines flights at Chicago O'Hare International Airport ( ORD ) and Houston Intercontinental Airport ( IAH ) under the United Express brand , as well as Delta Air Lines flights at Atlanta ( ATL ) , New York-LaGuardia ( LGA ) , and New York-JFK under the Delta Connection brand . 
<triplet> United Airlines <subj> Chicago O'Hare International Airport <obj> airline hub <subj> Houston Intercontinental Airport <obj> airline hub <triplet> Delta Air Lines <subj> Atlanta <obj> airline hub <subj> New York-LaGuardia <obj> airline hub <subj> New York-JFK <obj> airline hub