Yes, you have to have two-way communications with the tower, but doesn't guarantee that they will give you any instructions. If you're not landing at their airport, there is no requirement for a landing clearance.Not what i was taught during my PPL. Which was a few months ago. You need to establish 2 way comms with the tower prior to entering the Delta. I have personally heard over the radio 2 different pilots get deviations from not doing this.