Bankruptcy courts are an adjunct of the district courts.
The district court has jurisdiction over appeals from final judgments, orders and decrees of bankruptcy judges and over appeals arising from interlocutory (interim) orders and decrees of bankruptcy judges. 28 USC §158(d) now provides for direct appeals to circuit courts if certain criteria are met.
28 USC Sec 1291 - Final Decisions of District Courts
28 USC Sec. 1292 - Interlocutory Decisions