OPINION

Grady Jackson appeals from an order of the United States District Court for the Western District of Pennsylvania, denying his petition for a writ of habeas corpus pursuant to 28 U.S.C. § 2241. As no substantial question is presented by the appeal, we will summarily affirm the District Court’s judgment.

When reviewing the denial of a § 2241 petition, we conduct plenary review of a district court’s legal conclusions and review the court’s factual findings for clear error. Vega v. United States, 493 F.3d 310, 314 (3d Cir. 2007). Jackson, currently a federal prisoner, was shuttled between state and federal custody from February 1993 until September 22, 2004, when he was paroled to a federal detainer. In his petition, Jackson claimed that he was in the primary custody of federal authorities during this time, and that he should receive credit on his federal sentence from February 1993 to September 2004. The Magistrate Judge determined that Pennsylvania authorities obtained primary jurisdiction over Jackson on February 10, 1993, that Jackson remained primarily in state custody until his release on parole in September 2004, and that he was only “on loan” to federal authorities for prosecution and sentencing. 1 We have reviewed the record, and we find that the District Court’s findings are not clearly erroneous.

For the foregoing reasons, we will therefore affirm the District Court’s judgment.