U.S. Customs agents discovered 60 pounds of cocaine aboard an Eastern Airlines jetliner for the second time in about a week, officials said Wednesday.

The cocaine was discovered Monday afternoon aboard Eastern flight 972 after the Boeing 727 arrived in Miami from Barranquilla, Colombia, said Eastern spokeswoman Karen Ceremsak.A week earlier, Eastern posted a $900,320 letter of credit to regain the use of an L-1011 that was seized by Customs agents who found 56 pounds of cocaine aboard the jetliner after it arrived from Colombia.