slot times for everyone.
its not just the "small" operators that get in the way. just ask the 2330 from the west and 0530 from the east gaggles. you get 35+ EK as well as all the other major operators arriving in a very short space of time with pilots being genuinely surprised/astounded that they have to slow down/hold etc.
also slot depature times so that all those outbounds can get the levels they want instead of the ones that are left over.