Presentation #103.41 in the session Missions and Instruments.
Measurement of the polarization of X-ray emissions provides information about the innermost regions of compact objects in x-ray binary systems. The aim of the XL-Calibur X-ray polarimetry mission is to observe these systems in the 15-80 keV energy range to demarcate the accretion disk and coronal emission of black holes and to distinguish between rival models of emission from neutron stars and magnetars. Here we report on the planned flights for XL-Calibur and discuss the scientific potential of observing both southern and northern hemisphere X-ray binary sources. These observations are expected to complement observations made in the 2-8 keV energy band by the Imaging X-ray Polarimetry Explorer (IXPE) as well as other multi-wavelength observations of these sources.