In a number of ways:

1. Ask a flight attendant – the best way, especially if they are young and nice 🙂

2. Buy from another collector or on ebay.com: there are hundreds of safety cards from all possible airlines. That’s how you can get a very rare or old safety card.

3. Call or email an airline. If you are lucky, they can send you their safety cards for free.

4. Some airlines publish their safety cards on their websites. For example, you can download all Jat Airways safety cards on the airline’s website that made it available for all aviation enthusiasts. They have safety cards for ATR 72- 500, Boeing 737-400, Boeing 737-700, Boeing 737-800 and Boeing 737-900.