A person briefed on the matter confirmed the NTSB had agreed to take part but said it was unclear what if anything its representative would be able to do under U.S. sanctions.
The strikes were in retaliation for a US drone strike that killed top Iranian general Qasem Soleimani and Iraqi commander Abu Mahdi al-Muhandis last week.
State TV, citing a senior Revolutionary Guards source, also said Iran had 100 other targets in the region in its sights if Washington took any retaliatory measures.
The FAA outlined flight restrictions prohibiting US carriers from flying in the airspace over Iraq, Iran and the waters of the Persian Gulf and the Gulf of Oman.