State your actual deadline
Separate the China ready date from the date you need the goods in Iran. Flight time is only part of the journey; acceptance, airport handling and onward delivery also take time.
Actual vs dimensional weight
Weigh the packed cargo. Large, lightweight packages may be charged by dimensional weight. Confirm the divisor and rounding rules with the carrier.
Acceptance before booking
Describe the commodity, composition and any batteries accurately. Packing and supporting documents for special cargo need review before handover.