Travellers etiquette

Some travel tips suggest that to be polite, one should try to avoid:

• Snoring,
• Bumping others with one's luggage,
• Putting on makeup in public.

I was not successful trying to relocate my source for those tips.  Instead, I found the following list:

• Arrive early
• Stay calm even when receiving bad news
• Dress and pack sensibly with thought for security checks
• Create your own environment with shades, MP3 player, etc if you don't like what is provided
• Be thoughtful of others when taking calls on cellphone
• Share the arm rests
• Be considerate towards grumpy adults and tired children
• Reading over another's shoulder is rude
• Pack your own lunch if you have to, but avoid smelly foods if you do
• You can't choose your neighbours, but you can choose to be comfortable anyway.

What do you think?  Are there things you would like to add to or remove from these lists?  How should travellers today behave?

Is it any different from before?