https://www.supplychaindive.com/news/usps-peak-season-packages-parcels-capacity/604763/
USPS boosts sortation capacity, plans surcharges ahead of peak season | Supply Chain Dive
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https://www.supplychaindive.com/news/fedex-higher-surcharges-fees-2023-peak-season-demand/691988/
FedEx to implement higher surcharges for 2023 peak season | Supply Chain Dive
Added fees will apply to FedEx Ground Economy services, high-volume customers shipping more during the holidays and bulky or hard-to-handle packages.
peak season supplyfedexhigher