Bloomberg: A few times each month since August 2012, a helicopter or small plane has flown over sections of a 485-mile-long strip of land connecting Cushing, Okla., with Nederland, Tex., about 90 miles east of Houston. The pilots are usually accompanied by a photographer snapping pictures of construction work: dump trucks and backhoes mostly, and pieces of pipe lying along a trench. The idea is to track the progress of the southern leg of TransCanadas (TRP) Keystone XL pipeline, dubbed the Keystone Gulf Coast....