Small Numbers Above Callsigns

Hey guys!

I noticed that above every callsign, there is a small number. Could someone please briefly explain what that is? Thanks!



That is the altitude difference! +60 means they are 6,000 feet above you.

If they are lower, there would be a โ€œ-XXโ€


That is to indicate how many flight levels the aircraft is above or below you.

For example, whatever altitude youโ€™re cruising at, Alaska 57 is cruising 6,000 feet higher, and C-GFFD is cruising 2,000 feet lower.

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Thank you so much! This helps a lot.

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Thanks all! ๐Ÿ˜Ž