A near-miss at Boston Logan International Airport is under investigation by the U.S. Federal Aviation Administration after a Delta Air Lines flight aborted a landing attempt following a close encounter with an American Airlines jet. Multiple outlets report an aviation expert’s assessment that the two aircraft came within about 300 feet (about 90 meters) during the incident. The expert characterizes the event as occurring while the Delta aircraft was attempting to land, and that the close proximity required the Delta plane to abort its approach. The Guardian and PBS NewsHour both note that the incident happened on Saturday and that the FAA is investigating the circumstances involving the two commercial flights. The reporting emphasizes the proximity figure and the fact that Delta did not complete the landing as planned. None of the provided sources describes fatalities or injuries. Details such as the specific flight numbers, runway, and exact sequence of maneuvers are not included in the excerpts summarized here, with the focus remaining on the reported separation distance and the FAA probe into what happened.