I honestly believe UPS will be flying them but to get them out of China and the International travel. Apple and UPS may have contacted other fright carriers who contains more capacity. In 2020, Apple contracted with Cargo Lux. UPS was not even involved until it arrived to Louisville, Kentucky. After arriving UPS took over. The picture below you see is directly from Apple which contains the iPhones.
Logistically, Anything is possible that's why we have to look out for any departuring flights because we don't know and we don't have the data.