Best flight price tracker for e-commerce sellers

This is a heavily fragmented micro-niche sitting at the intersection of logistics, e-commerce, and travel tech. Roughly 15-25 tools claim to serve this space, but most are either generic flight price trackers (Google Flights, Kayak, Skyscanner) repurposed by sellers, or expensive freight-forwarding software with built-in tracking that costs $500+/month. The critical failure point: most tools don't integrate with inventory management systems or automatically alert sellers when carrier rates drop, leaving them making manual decisions. The real gap isn't tracking—it's *actionable intelligence*. Sellers need to know not just that prices dropped, but whether it's worth re-routing inventory, when to lock in rates, and how price fluctuations correlate with their restocking calendar. Today's solutions either track consumer flights (useless for bulk cargo) or require heavy manual input. A vibecoder solving this would focus on (1) connecting to actual freight APIs (FedEx, DHL, Air Cargo World pricing), (2) automating rate comparisons across carriers and routes, (3) integrating with Shopify/WooCommerce inventory systems, and (4) sending alerts tied to profit margin thresholds, not just price movement. The underserved angle: sellers managing SKU rotation across warehouses don't need general travel insights—they need micro-decisions on 500+ SKUs moving monthly.