We consider the relativistic Vlasov-Maxwell (VM) system with initial data of unrestricted size. In the 3D case, since the work of Glassey-Strauss in 1986, it has been known that as long as the 3D momentum support remains bounded then solutions can be continued and they will remain regular.  We prove that as long as there exists a plane upon which the momentum support remains bounded then solutions can be continued and they will remain regular.   We will also extend the Glassey-Strauss continuation criterion for the VM system to initial data with unbounded initial momentum support. Moreover, by using moment bounds and Strichartz estimates, we will show that it suffices to assume the kinetic energy density to be in $L^p$ for $p>2$ in order to guarantee that the solution remains regular.  These are joint works with Jonathan Luk.