朝4時半とか電車動いてませんからね！
まあカラオケ代で飛行機の追加料金出るような気もしなくもないですが、そこは気分的問題で！(笑)

Because the trains don't run at 4:30 a.m.!

Well, I can't say it didn't feel like I was paying the airline add-on fees with karaoke costs, but that was a matter of mood! :-)