Maergo has designed a platform to manage (and fill) excess capacity on commercial aircraft with parcels, to enable faster and cheaper shipping for the retailers selling those items.

The fact that this is using commercial aircraft means that the reliability could be affected especially if airline travel continues its challenges.  I should also note here that Amazon is starting to sell excess capacity on its planes as well to other shippers.

TechCrunch: Maergo raises $20M to provide Amazon-style fast and cheap air and ‘middle mile’ services to online retailers