到美國機票問題

根據 Timatic 內的資料，葡萄牙護照的持用人可以免簽証入境逗留九十天，但如果你是以免簽証入境的話，你一定要持有回程或去程機票（Oneway / onward ticket）。去程機票（Onward ticket）是指任可離開美國境內的機票（加拿大、墨西哥、加納比海各國除外）。

Passport required (must be valid at time of entry; passenger
may be authorized to stay until expiry date of passport).

Visa not required if travelling under the U.S. Visa Waiver
Permanent Program (V.W.P.) and following conditions are met:

Passenger:
- holds their own machine-readable passport (MRP) (issued for
each individual accompanying family member, including
infants); and
- holds a passport, if issued (or has been extended):
a. on or after October 26, 2005 but prior to October 26,
2006, containing digital photograph or integrated chip
with information from the data page (exempt from the chip
requirement are Temporary or Emergency Passports); or
b. on or after October 26, 2006, containing integrated chip
with information from the data page (exempt from the chip
requirement are Temporary or Emergency Passports); and
- travels for holiday, business or transit purposes only; and
- will stay up to 90 days or less; and
- arrives on a carrier that has signed agreement I-775 with
the U.S. Immigration; and
- holds a signed Form I-94W (Visa Waiver arrival/departure
form issued either by a carrier having signed the agreement
I-775 or by a travel agency); and
- holds onward/return ticket (or electronic ticket record or
return passages) with a final destination to a country other
than Canada, Mexico or countries/islands situated in or
bordering the Caribbean Sea, unless passenger holds proof of
residence in or transits to such country/islands, in which
case onward/return ticket to that country accepted. Ticket
validity is considered 1 year regardless of fare type; and
- is a non-immigrant; and
- waives the right to protest any action for deportation.

睇吓你係去做咩，如果是旅遊簽証就唔得。
如果是學生簽証(超過一年)，便不用買回程，到時回港放假才買雙程。而且你要考慮票價，雙程會平過單程好多。

would be any problem. BUT TROUBLE !!!!! you will not allow boarding the plane anyway !!!!