Air travel is generally one of the safest, most efficient ways to move between destinations, but many travelers still underestimate the importance of understanding airline rules, airport procedures, and basic safety practices. While the phrase “tuyệt đối không được làm việc này” may sound dramatic, it reflects a simple truth: there are certain actions that passengers should absolutely avoid, not because they cause immediate danger, but because they can lead to severe financial loss, legal trouble, or long-term consequences that may feel life-changing. Many people have faced serious difficulties simply because they did not know the rules.

One of the most common and most damaging mistakes is leaving valuables inside checked luggage. Many travelers assume their suitcase is secure once it disappears onto the conveyor belt, but baggage handling involves multiple stages, staff, and systems. Items such as laptops, jewelry, cameras, money, or important documents should never be placed in checked baggage. These objects are fragile, easily stolen, or could disappear if the luggage is delayed or misrouted. Countless travelers have lost expensive items forever simply due to this oversight. Airlines typically compensate only for the luggage weight, not for specific valuable items, leaving passengers with financial losses that feel devastating.

Another serious mistake is packing prohibited items without checking regulations. Many people unknowingly include aerosols, power banks, large lithium batteries, sharp objects, or liquids exceeding the allowed limit. While these items may seem harmless, they pose safety risks when placed in the wrong luggage. Power banks, for example, are strictly prohibited in checked luggage because they can overheat and cause fires. Some travelers have faced fines, delays, or mandatory luggage inspections that disrupted their entire trip. In some countries, carrying restricted items—even accidentally—can lead to legal trouble.

A third harmful action is ignoring airline instructions regarding carry-on size and weight. It might seem trivial, but passengers who insist on bringing oversized or overweight carry-on bags onto the plane often face last-minute fees far higher than the normal baggage cost. In stressful situations, many end up paying more than expected, causing financial strain and emotional frustration. Worse still, trying to force heavy luggage into overhead bins can injure yourself or others, leading to medical issues that linger long after the trip.

Another behavior that can cause life-altering consequences is joking or making misleading statements about bombs, weapons, or threats. Even if said casually, such comments are taken extremely seriously at airports around the world. Security personnel may detain the individual, issue fines, or place travel bans. Some passengers have missed international flights, lost jobs, or faced legal records because of a careless remark made in line or during security screening.

Travelers should also avoid letting their passport or personal documents out of sight, especially in crowded terminals. Document theft can derail entire travel plans, leaving someone stranded in a foreign country, unable to board flights, or forced to spend days obtaining temporary travel papers.

In the end, the lesson behind the warning “nhiều người cũng đã ‘tàn đời’ vì thiếu hiểu biết” does not refer to literal danger, but rather to the very real consequences of losing valuables, facing unexpected expenses, encountering legal trouble, or experiencing serious travel disruptions. These issues can create long-lasting stress and financial burden.

The best way to avoid trouble is simple: stay informed, follow airline guidelines, pack responsibly, and treat airport procedures with seriousness. A little awareness can protect your trip—and your peace of mind.