UPS, FedEx and Southwest are offering to package up to $50,000 worth of flights to and from the US mainland, according to the Wall Street Journal.
The deal, announced Wednesday, was first reported by Bloomberg.
The package pickup service, which has been used by airlines to deliver packages to customers, was launched last year.
The company said it would not renew the contract, but that it could resume it if needed.
“The company has secured a new round of financing from Deutsche Bank, and we are actively pursuing other strategic partnerships, including strategic relationships with major carriers,” Southwest Chief Executive Ed Bastian said in a statement.
“We are committed to delivering high-quality packages to our customers.
Southwest will continue to provide the best possible service for all our customers, and to work with other carriers to develop new ways to deliver and deliver value to our global customers.”
The company is still working on getting the deal approved by US regulators.
FedEx said it had a deal in place with a U.S. carrier that would pay for the $50m worth of delivery, but would not provide any details.
A Reuters report on Wednesday said that the deal with the U.K.-based company, which also sells packages to passengers at domestic and international airports, was signed in May, but was not made public.