"substitute carrier" is a perfectly correct and usable phrase in written English.
You can use it to refer to a person or company that serves as a replacement for another person or company, usually in a contractual agreement. For example, you could say: "The substitute carrier had a much more expensive rate than the original carrier, so we decided not to use their services."
"We are trying to extend our services to the long-term unemployed," said its director, Tony Badman, a former tech company middle manager who was working as a substitute letter carrier for the U.S. Post Office.
The artist is facing the vast and imposing facility where Bukowski worked for 14 years, first as a substitute letter carrier and later as a mail sorter, and where he took inspiration for his 1971 novel "Post Office".
The applications of these biomacromolecular capsules in biotechnological fields have also been summarized, for instance blood substitute, ATP carriers, photodynamic therapy and nanomedicines.
Many drug delivery systems have already been developed to deliver drugs to this receptor using lactosaminated or galactosamine substituted drug carriers.
Therefore, the scaffold can play the role of bone substitute and drug carrier simultaneously.
The FCC needs to authorize the discontinuation of the service, "unless it is shown that customers would be unable to receive service or a reasonable substitute from another carrier or that the public convenience and necessity is otherwise adversely affected".
The FCC will normally authorize this proposed discontinuance of service unless it is shown that customers would be unable to receive service or a reasonable substitute from another carrier or that the public convenience and necessity is otherwise adversely affected.
Due to limitations associated with whole blood for transfusions (antigen compatibility, transmission of infections, supply and storage), the use of cell-free hemoglobin as an oxygen carrier substitute has been in the center of research interest for decades.
He said, however, "The issue is whether they will stimulate new traffic or act as a substitute for charter carriers".
The resulting regional substitution effectiveness was robust with regard to variations in the assumptions and life cycle emissions but very sensitive to the type of fossil energy carrier substituted (Table 4).
