It sounds like you mean the cargo uplift or cargo loading process for a flight. In airline and airport operations, “uplift” usually refers to freight or baggage being accepted and loaded onto the aircraft for departure.

Likely term

  • Cargo uplift : the cargo is loaded onto the aircraft.
  • Cargo build-up : cargo is packed into pallets or containers before loading.
  • Ramp loading : the cargo unit is staged and loaded onto the plane at the aircraft stand.

In Singapore

At Singapore Changi Airport, cargo typically moves through acceptance, screening, build-up into ULDs or pallets, and then ramp loading before the flight departs.

About “03:00 PM flight”

If you mean the cargo is loaded for a 3:00 PM departure, you could say:

  • “Cargo uplift for the 3:00 PM flight.”
  • “Cargo loading for the 3:00 PM sector.”
  • “Build-up and ramp loading for the 3:00 PM departure.”

TL;DR: the most natural term is cargo uplift or simply cargo loading.