5. What am I?

My first is in 'glow' but not in 'blow',

My second is in 'snow' but not in 'slow'.

My third is in 'lane' but not in 'line',

My last is in 'ten' but not in 'nine'.

My whole is an aeroplane you can see up high,

What, oh what, am I?

Can you make up your own riddle for someone else to solve?