Presenting a bus, train, or ferry ticket serves as sufficient proof of onward travel. This is because it shows that you have made concrete plans to leave, and it provides assurance to the immigration authorities that you won't be overstaying your visa or remaining in the country illegally.
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A few countries definitely require documented proof of onward travel. They include New Zealand, United Kingdom, United States, Brazil, Indonesia, Costa Rica, Peru, and the Philippines.
Proof of onward travel means that airlines and governments want to make sure you are not illegally immigrating to their country, so they need to see proof of a return ticket home.
You can only remain outside the United States, however, as long as you re-enter the U.S. before the expiration date printed on your travel document. The travel document is valid for one year after it's issued, typically within 150 days (in some cases longer) after submitting your application materials to USCIS.
Proof of confirmed travel plans can be plane ticket confirmation, business letter, or employment letter from the business HR Department. You can submit a copy of your flight itinerary, plane ticket, plane e-ticket, or any other flight confirmation.
In most countries, you can travel anywhere within your nation's borders without a passport. The only exception is when you leave your home country to enter a foreign nation. However, even if you travel nationally, you will always need photo ID, such as a driver's license or National ID card to board a flight.
It all depends upon the fare type. If it's refundable, you can cancel and re-book. If it's non-refundable then you lose the return fare. Please note, on a round trip ticket, if you want to use one way, you can only use the outbound trip and not the inbound.
Can I travel outside the U.S. with a green card? Yes, you can travel abroad as a green card holder — that's one of the many benefits of being a permanent resident. However, your trip must be temporary and you cannot remain outside the United States for more than 1 year.