Those should be CARGO flights.

Here's all the cargo flights: arriving/departing NLU

Emirates SkyCargo[44] Copenhagen, Dubai–Al Maktoum, Frankfurt, Guadalajara, Houston–Intercontinental, Los Angeles, Quito, Zaragoza Estafeta Air Cargo Miami, San Luis Potosí, Villahermosa
Seasonal: Mérida Ethiopian Airlines Cargo[45] Addis Ababa FedEx Express Anchorage, Memphis LATAM Cargo Brasil Miami, São Paulo–Guarulhos Lufthansa Cargo[46] Chicago O'Hare, Dallas/Fort Worth, Frankfurt, Guadalajara, New York–JFK Mas Air Anchorage, Bogotá, Buenos Aires–Ezeiza, Campinas, Frankfurt, Greenville–Spartanburg, Guadalajara, Guatemala City, Guayaquil, Hong Kong, Lima, Los Angeles, Miami, Panama City–Tocumen, Quito, San José (CR), Santiago de Chile, Seoul–Incheon, Zhengzhou[47] MSC Air Cargo[48] Anchorage, Indianapolis, Liege National Airlines Cargo Anchorage, Campinas, Dallas/Fort Worth, Miami Qatar Airways Cargo Atlanta, Bogotá, Dallas/Fort Worth, Doha, Houston–Intercontinental, Liège, Los Angeles, Luxembourg, Macau, Nagoya–Centrair, Ostend/Bruges,[49] Paris–Charles de Gaulle, Zaragoza Silk Way Airlines Houston-Intercontinental, Miami Tianjin Air Cargo Cincinnati Turkish Cargo Bogotá, Chicago–O'Hare, Curaçao, Houston–Intercontinental, Istanbul, Maastricht/Aachen, Madrid UPS Airlines Louisville