There's a difference between the regular lounge anyone can buy day passes/memberships to, and the premium-class lounges for international flights. Access to the

There's a difference between the regular lounge anyone can buy day passes/memberships to, and the premium-class lounges for international flights. Access to the former does not get you access to the latter; typically, only an actual premium-class international ticket for that day, or possessing top-tier frequent-flier status in the airline or alliance, gets you into those.