A delivery estimate belongs to a country, configuration and moment. The shortage reported in early August should not be read as a live inventory statement in September.

Separate reporting from a current order
MacRumors’ August 2 report, citing Mark Gurman’s Bloomberg newsletter, described constrained MacBook Air supply and US estimates of two to six weeks. Those observations are historical. We have not independently reconstructed Apple’s stock at that date, and the linked Bloomberg newsletter was not accessible for a full-text review.
TrendForce’s July 9 survey forecast a 13-18% quarter-on-quarter increase in server DRAM contract prices for Q3. That is neither all memory nor the percentage increase in a MacBook’s retail price.
Industry pressure does not identify one delayed order
A component-market forecast can explain why availability deserves attention. It cannot prove which component holds up a particular configuration. Assembly schedules, allocation by country, retail inventory and delivery logistics are additional variables. A store showing a longer wait for one RAM option is an observation; assigning its precise cause needs more evidence.
Our comparison diagram deliberately uses no live prices. For each candidate, record the exact memory and storage, seller, delivery interval and total price at the same time. Compare a stocked equivalent before deciding that a more expensive model is the only route to a usable machine.
Make the deadline explicit
If you need a computer before a course or project begins, the useful quantity is the latest promised arrival relative to that deadline. A slightly cheaper order arriving afterwards may fail the actual requirement. Conversely, paying for a configuration you do not need has a real cost even when it ships sooner.
Keep the order confirmation and recheck availability when purchasing. The August report establishes a past supply concern, not a recommendation to panic-buy or a forecast that prices will necessarily rise from today.
September 8: date the August stock report, distinguish server-DRAM forecasts from Apple retail evidence, and replace stale delivery advice with an order comparison.