机场/梯子 vs. VPN: What's Actually the Difference?

“Just use a VPN” is probably the most common piece of advice about getting past internet censorship — and it’s often not quite right. 机场 (“jichang,” literally “airport”), 梯子 (“ladder”), and VPN get thrown around as if they mean the same thing, but they’re built to solve different problems.

What a VPN is actually for

A VPN (Virtual Private Network) was originally designed around privacy and security, not defeating censorship. The classic use cases: an employee connecting to a company’s internal network remotely, encrypting traffic on public Wi-Fi, or switching your apparent location to access region-locked content.

Mainstream commercial VPNs tend to use a fairly fixed set of protocols and well-known server addresses — fine for privacy use cases, but exactly the wrong shape for defeating a censorship system with deep packet inspection (DPI) capability like the Great Firewall. Recognizable protocols get flagged, and well-known server IPs get blocked in bulk. That’s a big part of why plenty of people download a popular VPN in mainland China and find it simply doesn’t connect.

What a 机场/梯子 is actually for

“机场” and “梯子” are really two names for the same category of thing: a proxy service purpose-built and optimized for getting past censorship. Unlike a general-purpose VPN, the protocol choice itself is built around defeating DPI — for example, VLESS paired with Reality transport, which disguises traffic as an ordinary HTTPS connection so inspection tools have a much harder time telling it apart from normal browsing.

These services also typically hand you a subscription link that unlocks a whole batch of nodes across many countries at once, rather than the handful of fixed servers a typical VPN offers. On the infrastructure side, the better providers run on IPLC dedicated lines, keeping your traffic completely off shared public routing — something most consumer VPNs simply don’t offer.

Side by side

	VPN	机场 / Ladder
Built for	Privacy, remote corporate access	Defeating censorship
Protocol behavior	Fairly fixed, easier for DPI to flag	VLESS/Reality and similar anti-detection protocols
Node coverage	Usually a handful, known addresses	Subscription-based, many nodes, refreshed regularly
Line quality	Varies by provider	Better providers run IPLC/IEPL dedicated lines
Resistance to blocking	Weaker	Purpose-built for it

So which one do you actually want?

If you’re in mainland China trying to reliably reach blocked sites and services, a 机场-style service is generally the better fit than a general-purpose VPN — not because VPNs are bad, but because they’re solving a different problem. VPNs are built for privacy; 机场 services are built specifically to get past the wall.

That said, the quality gap between providers is real. Our earlier guides on choosing a reliable service and avoiding scams cover what to actually check — line type, protocol, whether the pricing makes sense, and whether support is reachable.

Firefly is built around exactly that checklist: IPLC dedicated lines across the board, VLESS with Reality, an overseas team, English-capable support, and several plans to choose from. Worth comparing directly if you’re still weighing options.