Passengers will only use one terminal at Newcastle Airport, common to all flights. The airport building is very small and often overcrowded.
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There is a significant shortage of seating after security and there are hardly any seats in the public area.
Passport control on arrival can take upwards of 45 minutes, whereas security checks before departure tend to be more organised and you'll usually spend 15-20 minutes in line.
Transferring between flights
Newcastle is not primarily a transfer point and therefore the airport has no direct transfer option at all without leaving the transit zone.
You always have to go through passport control, come out, walk between the arrival and departure halls and check in again.
If you plan to transfer on your own in Liverpool, expect a net transfer time from arrival to departure gate of approximately 60 minutes.