Whatever your situation, Amazon Flex can offer you the freedom and flexibility to be your own boss and to earn extra money. This includes being able to ask someone else, your 'Substitute', to make deliveries on your behalf in advance and up to 65 minutes before the block starts, if your plans happen to change.
If you substitute a block, Amazon Flex will still pay you for the completed block and it is your responsibility to pay your Substitute for their delivery services at any rate you agree with them, based on the services they provide. You’re also still fully responsible for the reliability and delivery quality of the block, regardless if the block is delivered by either you or your Substitute.