An airliner is specifically a large aircraft for many passengers, not any aircraft like private jets. Tom owns a private jet, not an airliner.
Pro Tip 2/3
Long-Distance Travel
Airliners are mainly used for longer trips between cities or countries, not short, local flights. The trip from Chicago to Tokyo requires a long-haul airliner.
Pro Tip 3/3
Commercial Usage
Airliners are typically operated by airlines and are commercial, not military or private planes. The commercial airliner was ready for boarding.