The more the merrier! So barring anything bad happening () and yes that's always a real possibility here. This coming year, 2018, should see the single largest net fleet growth (35 to 40 airframes) in the 20+ years that I've been paying attention.

Note #1 - The older ex-LUAL 757-200's are slated to get the NGS mod so I'm assuming all 15 airframes hang around for a bit. You would probably have had some note in the previous earnings release if they were leaving.

Note #2 - The 35 ex-LUAL 767-300's are now getting Polaris (2 are done, 3 are in HKG right now) so likewise to the above. They will probably be with us into the 2020-2025 timeframe. Polaris is a big $'s 3 month upgrade per airframe so I doubt this is short term orientated.