Illegal contraband is seized virtually every day at Frankfurt Airport - even if it is not always clear whether those sending or carrying it knew that it was illegal. This dagger violates Germany's weapons control laws.

Forging labels of high-street brands remains one of the most common crimes uncovered by customs officers, who presented this fake Reebok sneaker at a press conference this week

Sometimes customs officers have to have a sharp eyes. Last year, they noticed that these nail clippers weren't really from the town of Solingen - another example of fraud.

Ivory is a much-smuggled material - and buying and selling it can be a violation of the Washington Convention on International Trade in Endangered Species.

The current on this electronic pulse cigarette lighter was found to be too high - another violation of the law that officers pulled up. It was taken out of circulation.

This Chinese imitation Lego was seized - an obvious and illegal copy of the original.

Smuggled weapons sometimes fall into the hands of German customs officials too.

The plane tails of Australia's national airline Qantas are embellished with a stylized kangaroo, hence the nickname "the Flying Kangaroo!" Even from a far distance, it's easy to tell which continent the plane comes from. After all, kangaroos only exist in Australia. This animal has become a sort of national logo, appearing not only on planes but also on Australia's coat of arms and currency.

In contrast to its Australian counterpart, the logo of KLM Royal Dutch Airlines is more factual. The abstract symbol of a crown in combination with the three letters KLM leaves no doubt as to which country this plane comes from. And that's what logos are all about.

The tiny West African state is a paradise for birds and their friends. More than 500 different kinds of birds live in the Gambia. Tourists don't even need to take birdwatching trips because many birds can be spotted in hotel gardens — they're just everywhere! Perhaps unsurprisingly, the Gambian national airline went for a bird as its logo when it was founded in 2012. Service ceased in 2014.

The Seattle-based airline has proved its creativity on several occasions during its 90-year-long history. The company was among the first airlines to sell tickets online and to offer online and automatic check-ins. Like its name, the logo of the airline refers to Alaska and its indigenous inhabitants, the Inuit.

A trade embargo and political tensions between 1980 and 2016 made it hard for Iran's state airline with headquarters at Tehran's Mehrabad airport to modernize its planes. But maybe the "homa," the mythological bird used in the logo, came to the rescue of the airline. According to Persian mythology, "homa" is believed to bring luck and joy while living its life entirely in the sky.

Over the years Tanzania's national airline has also had to face numerous challenges. Sometimes its fleet was in the air, sometimes not, and the airline's owners also frequently changed. It's certainly not the fault of the giraffe logo. The world's tallest animal looks so friendly and inviting on the plane;what passenger could say no to stepping onboard for a trip to Mount Kilimanjaro?

A crane has served as the logo of Germany's largest airline since 1918. Some types of cranes cover enormous distances when they migrate, but others are considered pests due to their enormous appetites. Lufhansa is now flying into the future with a new logo design. The symbol will be the same, but the colors will change. Goodbye yellow and gray, hello simple white and blue!