The shares controlled by AIMIA represent about 49 percent of PLM, and Grupo Aeromexico owns the remaining 51 percent of the company, Aeromexico said in a statement. Aeromexico said the proposal will be valid through August 3.

PLM Premier operates Club Premier, a loyalty program with four million members.

(Reporting by Veronica Gomez Sparrowe; writing by Julia Love; Editing by Chizu Nomiyama)