That small 4-digit code printed on your boarding pass? It’s not just admin. It’s data. 💡 Here’s what it can reveal: ✅ Your fare class: It’s often linked to your booking category — airlines know instantly if you’re full-fare, discounted, or on points. ✅ Security status: Certain internal codes flag passengers for additional screening or fast-track clearance. ✅ Airport routing: It helps ground staff direct luggage, connections, and crew notifications. ✅ Upgrade eligibility: Higher fare classes (ev
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