The Metropolitan Transportation Authority will begin an internal debate on its advertising policies in earnest on Thursday, just more than two months after its refusal of an anti-Muslim ad campaign was ruled to have violated the First Amendment of the Constitution.

WSJ: MTA Ad Policy Faces Overhaul

Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel.

ECONOMIST: Unconventional gas

On Tuesday, the U.S. National Transportation Safety Board said it was conducting a chemical analysis of internal short circuiting and thermal damage of the battery that caught fire in Boston.

NPR: US Regulator Asks Boeing For Full Battery History

Delta spokesman Anthony Black said the airline is cooperating with the FAA and the National Transportation Safety Board in their investigation, as well as conducting an internal investigation.

CNN: FAA probes plane's landing on Atlanta airport's taxiway