搂主第一次坐两舱是2015年末，当时从美国了转好多趟就为一躺国泰航空的头等舱，在那次回国行程中，搂主除了一个电脑包跟一个登机箱作为跟身行李之外，还托运了三件行李。自那次经历之后，搂主便认为三件免费行李托运额即为头等舱的标配；然而，在某次规划线路时搂主惊奇发现某世界排名靠前的航空竟然头等舱只允许免费托运两件，于是决定查遍常见中美之间飞行常见航空公司的免费托运行李额，以便规划线路时查阅。
免费托运行李额除了跟舱等有关系外，还跟路线、乘机人年龄、会员等级等方面有关，本文仅讨论舱等对中美之间飞行行李额的影响，其余变量均控制为一般数值，即乘机人为成人、无会员等级或会员等级为最基础的级别。
符号释义：A/B/C，A为免费的件数，一般为[0,2]；B为每件行李 长宽高之和的最大值，以inch计，如经济舱一般为62 in (158 cm)；C为每件行李重量的最大值，以lb计，如经济舱一般为50 lb (23 kg)。NA表示中美联程票内不存在此舱等。
“美国优先”大礼包：按照美国交通部的规定，对于始发地或目的地在美国境内的旅程，第一承运人（单程票为第一航段承运航空公司，往返票为去程段的第一航段承运航空公司）的行李政策适用于整个行程。
星空联盟：
| 航空公司（星空联盟） | 基础经济舱 | 经济舱 | 商务舱 | 头等舱 | 说明 |
|---|---|---|---|---|---|
| Air Canada [AC] | NA | 1/62/50 | 2/62/70 | NA | |
| Air China [CA] | NA | 2/62/50 | 2/62/70 | 2/62/70 | |
| ANA [NH] | NA | 2/62/50 | 2/62/70 | 3/62/70 | |
| Asiana Airlines [OZ] | NA | 2/62/50 | 2/62/70 | 3/62/70 | |
| Austrian Airlines [OS] | NA | 1/62/50 | 2/62/70 | NA | 经济舱如果有会员卡为 2/62/50 |
| EgyptAir [MS] | NA | 2/62/50 | 2/62/70 | NA | |
| Ethiopian Airlines [ET] | NA | 2/62/50 | 2/62/70 OR 3/62/50 | NA | 商务舱行李可以 2 件每件不超过 70 磅，或者 3 件每件不超过 50 磅 |
| EVA Air [BR] | 1/62/50 | 2/62/50 | 2/62/70 | NA | 长荣航空称 A 舱为轻省经济舱 |
| LOT Polish Airlines [LO] | NA | 2/62/50 | 2/62/70 | NA | LOT 的基础经济舱为 Eco Saverr ，经济舱为 Eco Standard 和 Flex ，中美单程或往返适合表中数据，美中单程或往返，则基础经济舱和经济舱的免费托运额只有 1 件。 |
| Lufthansa [LH] | NA | 1/62/50 | 2/62/70 | 3/62/70 | LH 有基础经济舱，但是只限于美欧航线 |
| Scandinavian Airlines (SAS) | NA | 1/62/50 | 2/62/70 | NA | |
| Shenzhen Airlines (ZH) | NA | 2/62/50 | 2/62/70 | 2/62/70 | |
| Singapore Airlines (SQ) | NA | 2/62/50 | 2/62/70 | 2/62/70 | |
| South African Airways [SA] | NA | 2/62/50 | 2/62/70 | NA | |
| Swiss Air [LX] | NA | 1/62/50 | 2/62/70 | 3/62/70 | |
| Turkish Airlines [TK] | NA | 2/62/50 | 2/62/70 | NA | |
| United Airlines [UA] | NA | 1/62/50 | 2/62/70 | 2/62/70 |
寰宇一家：
| 航空公司（寰宇一家） | 基础经济舱 | 经济舱 | 商务舱 | 头等舱 | 说明 |
|---|---|---|---|---|---|
| Alaska Airlines [AS[ | XX | XX | XX | XX | 官网原话If your travel includes multiple tickets, and/or travel on more than one airline, your baggage fees and rules may be determined by the other airline. Please check your ticket, or call Alaska Airlines Reservations at 1-800-252-7522 to help determine which airline rules and fees apply to your journey. |
| American Airlines [AA] | NA | 1/62/50 | 2/62/70 | 3/62/70 | 基础经济舱托运行李对中美航线无额外限制 |
| British Airways [BA] | NA | 1/62/50 | 2/62/50 | 2/62/70 | |
| Cathay Pacific [CX] | NA | 2/62/50 | 2/62/70 | 2/62/70 | |
| Finnair [AY] | NA | 1/62/50 | 2/62/50 OR 3/62/50 | NA | 商务舱行李，美国出发的单程 / 往返票为 2/62/50 ，中国出发的单程 / 往返票为 3/62/50 |
| Iberia [IB] | NA | 2/62/50 | 2/62/50 | NA | |
| Japan Airlines [JL] | NA | 2/62/50 | 3/62/70 | 3/62/70 | |
| Qatar Airways [QR] | NA | 2/62/50 | 2/62/70 | 2/62/70 | |
| Royal Air Maroc [AT] | N/A | 2/62/50 | 3/62/50 | NA |
天合联盟：
| 航空公司（天合联盟） | 基础经济舱 | 经济舱 | 商务舱 | 头等舱 | 说明 |
|---|---|---|---|---|---|
| Aeroflot [SU] | NA | 1/62/50 | 2/62/70 | NA | |
| Aeromexico [AM] | NA | 2/62/50 | 3/62/70 | NA | |
| Air France [AF] | NA | 1/62/50 | 2/62/70 | 3/62/70 | |
| China Airlines [CI] | NA | 2/62/50 | 2/62/70 | NA | |
| China Eastern [MU] | NA | 2/62/50 | 2/62/70 | 3/62/70 | |
| Delta Airlines [DL] | 1/62/50 | 1/62/50 | 2/62/70 | NA | |
| Garuda Indonesia [GA] | NA | 2/62/50 | 2/62/70 | NA | |
| KLM [KL] | NA | 1/62/50 | 2/62/70 | NA | |
| Korean Air [KE] | NA | 2/62/50 | 2/62/70 | 3/62/70 | |
| Saudia [SV] | NA | 2/62/50 | 2/62/70 | 3/62/70 | |
| Virgin Atlantic [VS] | NA | 2/62/50 | 3/62/70 | NA | |
| Xiamen Airlines [MF] | NA | 1/62/50 | 2/62/70 | 3/62/70 |
群雄航空：
| 航空公司（群雄航空） | 基础经济舱 | 经济舱 | 商务舱 | 头等舱 | 说明 |
|---|---|---|---|---|---|
| China Southern [CZ] | NA | 2/62/50 | 2/62/70 | 3/62/70 | |
| EL AL airlines [LY] | NA | 1/62/50 | 2/62/70 | 3/62/70 | |
| Etihad Airways [EY] | NA | 2/62/50 | 2/62/70 | 2/62/70 | |
| Emirates [EK] | 1/62/50 | 2/62/50 | 2/62/70 | 2/62/70 | EK 的“基础经济舱”为 Eco Special ，其余经济舱类别均按照“经济舱”标准 |
| Hainan Airlines [HU] | NA | 2/62/50 | 2/62/70 | NA | |
| Hong Kong Airlines [HX] | NA | 2/62/50 | 2/62/70 | NA | |
| Philippine Airlines [PR] | 2/62/50 | 2/62/50 | 2/62/70 | NA | |
| Sichuan Airlines [3U] | NA | 1/62/50 | 2/62/70 | NA | 疫情后目前只有中-加航班 |
| Starlux Airlines [JX] | 1/62/50 | 2/62/50 | 2/62/70 | 3/62/70 | JX的“基础经济舱”为“限量经济舱”，订位舱等为Q |
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