Hi, i am writing a report, but i cannot understand this question.

"Given that there are only two companies from which your client may source the aircraft, what are the main considerations in trying to get the best deal for your client? Pay attention to how you would set up a tendering process in order to achieve the best price for the aircraft. You should also include a discussion of the risks to the airline once it has taken delivery of the aircraft"

what is.. tendering process to but a aircraft?