Hi skaya,
Thanks for your post. When crediting air miles, these are credited separately from each rental, even for rentals that are back-to-back. If you have 3 rentals booked in this way, this will be processed as 3 separate lots of air miles on the applicable rates.
Please be aware that we can only credit one set of points per rental, so we are only able to credit any points to the main driver.
I hope this helps. If you require any further information, please send me a private message with your reservation numbers and I will endeavour to answer any questions that you may have.
Best regards, Gary Caudwell