 The goal of this clinical research study is to learn how often a fiberoptic bronchoscopy FOB -- also known as a fiberoptic scope procedure needs to be used with a video double lumen tube VDLT during surgeries that require lung isolation. On this study, you will have one of 2 types of commonly-used breathing tubes used, either a VDLT or a non-video double lumen tube called a non-video DLT. An FOB may or may not be performed, as described below. 