Megabus:While not required, we do suggest you bring a printed copy of your reservation confirmation email, as this will include your reservation number(s). No physical tickets are issued for travel.https://us.megabus.com/help/traveling-on-the-bus 灰狗:When purchasing your ticket, simply select the E-Ticket option. Or, if you already purchased a Print-At-Home or Will Call ticket, you can change it to E-Ticket by clicking the "Get Your E-Ticket" button in your email confirmation.https://www.greyhound.com/en/help-and-info/road-rewards/e-ticket
灰狗:When purchasing your ticket, simply select the E-Ticket option. Or, if you already purchased a Print-At-Home or Will Call ticket, you can change it to E-Ticket by clicking the "Get Your E-Ticket" button in your email confirmation.https://www.greyhound.com/en/help-and-info/road-rewards/e-ticket
Megabus 可不打印, 手机出示短信即可。 可以在等车的 地方买, 要等全部上满客后, 有空位才能买--用现金。
灰狗不太清楚。