If your group lands at LIN at 10:05, do they also need to claim bags and clear passport control/customs? If so, you might not be as late as you thought.

As far as a receipt, the word is "ricevuta" or "scontrino". I grew up using the former, but anyone in Italy will know both. "Posso avere la ricevuta / il scontrino, per piacere?" You may want to tell the driver when you get in, not on the way out. Not sure what the situation on credit cards in taxis is there, but if it looks like they might take them, confirm that when you get in - that's good advice in any city, not just an Italian one. I can't tell you the number of times I've gotten into a cab in DC and the credit card machine "is down." It's suddenly not down when I tell them I need to use a corporate card and that I'll have to take another cab. Anyway, if your driver doesn't speak English, the way I'd ask is, "E possibile a usare la carta di credito?" Or sometimes I like to be specific on the type, especially if it's Amex, "E possibile a usare la visa/mastercard/american express?"

Oh and a big generalization, but odds are in a major Italian city in the North, you'll get a driver that speaks enough English to get by.