Can I apply for airfare reimbursement for a foreign associate?

Yes, but only if he/she is an employee of the co/recipient or co/applicant (agreement, part-time).

Yes, but only if they are an employee of the co/recipient or co/applicant (agreement, part-time). This reimbursement must not exceed the daily cost of per diem tables (search for Current EU Per Diem Rates and more… – per-diems.info).