IAS and cabin pressure

IAS, but also EAS and CAS in the flight info panel, for reference, IAS is the speed measured by pitot and static probes. EAS is corrected for probe placement, for high speeds. CAS is corrected for temperature, for high altitudes.
Cabin pressure, if you drive part of the compressed air from jet engines and send them in a closed compartment, pressure will rise in this compartment. If an astronaut stays in a under pressurised zone for too long, death.
Bonus: mach tuck, wings obstruct control surfaces when transonic and supersonic and autothrust: select speed, it automatically puts the right amount of thrust to maintain this speed.