"AliExpress Standard Shipping" and "China Post Registered Airmail" are dispatched with a global tracking number. You can track them on any tracking website, including Pakistan Post's.
Also, they rarely get lost because everything is recorded in a global database. In case they do, just provide AliExpress a screenshot of tracking history and they will issue a full refund within 24 hours, no questions asked.
I've ordered countless stuff via 'Registered Airmail' and a CPU via 'Standard Shipping', never had any problems.