Tipping for curbside services, such as airport "Skycaps" or hotel valets, is a standard and highly expected practice in North American travel culture. For curbside check-in at the airport, it is customary to tip $2 to $5 per bag, especially if the attendant is helping you bypass long terminal lines or handling heavy luggage. These workers often rely on tips as a significant portion of their income. For hotel valets, the standard is usually $2 to $5 specifically when they return the car to you, though some guests choose to tip upon drop-off as well to ensure extra care. In a world of increasing "digital tipping" prompts, curbside service remains one of the few areas where cash is still king. Failing to tip for these physical, time-saving services is generally seen as a breach of travel etiquette. If the attendant provides extra assistance, such as helping with a stroller or providing local directions, rounding up to $10 is a generous gesture that is always appreciated.