According to a new supply chain report, bottlenecks in making components for the iPad mini with Retina are now gradually being removed. The positive results equated to Apple ordering four million units in November. Currently, Apple's orders for the iPad mini with Retina have already surpassed those for the first-generation iPad mini, the sources noted.
As for the iPad Air, the report states that "the supply chain had a longer preparation time so the device is seeing much more stable supply compared to previous-generation devices when launched."
Shortages of Retina displays were the main reason causing the iPad mini to suffer from tight supply since manufacturing a 7.9 inch Retina display is more difficult than a the larger 9.7 version.