Step 2: IATA Job Aid – Air or US Mail Decision tree to help determine the classification for substance if shipping by air. Job Aid PDF Job Aid Word File Associated Course Packing and Shipping Dangerous Goods: What the Laboratory Staff Must Know Related Job Aids Step 2: DOT Job Aid – Motor Vehicle Courier Train or Cargo Ship Tags Packing and Shipping Covid-19 Related Step 2: IATA Job Aid - Air or US Mail Help us improve! Please share your feedback.