Comparison of even-toed ungulate and cetaceans genetic material has shown that the closest living relatives of whales and hippopotamuses is the paraphyletic group Artiodactyla. Dan Graur and Desmond Higgins were among the first to come to this conclusion, and included a paper published in 1994.
Definition of roundâtrip. : a trip to a place and back usually over the same route.
American gives the example of a flight to London from Dallas, which is 9,502 miles round-trip and costs $1,894. Under the new system, AAdvantage members would earn 9,470 miles. The amount of miles needed to book economy-class tickets in the United States or abroad will stay largely the same.