Grounding of Boeing 737 Max, cause a lot of problem for many operators of aircraft type. There are no available airplanes worldwide to cover the gap of the 375 units of 737Max.
Charter carriers and their flights to Greece effected. In some cases, some charter carriers, reducing their flights for summer 2019 in Greek destinations, due luck of aircraft.
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Here is list of leased aircraft used by airlines flying to Skiathos and it is possible to visit the airport during summer of 2019:
(with blue text is the date seen for the first time at Skiathos)
Arkefly using a Euro Atlantic Airways Boeing 737-800 registration CS-TQU
Arkefly using a Getjet Airlines Airbus A320 registration LY-OWL
Arkefly using a Gowair Airbus A320 registration EC-MXJ (all white no titles)
Arkefly special livery TUI (Sunny Cars Livery) / Sunwing Boeing 737-800 registration C-FDBD
Arkefly using a TUI Belgium B737-800 registration OO-JBG (seen at Skiathos on 03MAY)
Arkefly using Olympus Airbus A321 registration SX-ACP
Arkefly using Olympus Airbus A321 registration SX-ACY
Arkefly using Sunwing Boeing 737-800 registration C-FTDW
Arkefly using Airbus A320 all white, with Arke logo and titles only registration LY-ELK A320
Enter Air using Go2Sky Boeing 737-800 registration OM-GTG (all white)
Travel Services using a Boeing 737-800 of Air Explore registration OM-IEX
Travel Services Boeing 737-800 registration OK-TSE in full Air Transat colours
Travel Services using a Boeing 737-800 with CSA basic livery registration OK-TST
Travel Services using a Boeing 737-800 with EAL (Swift Air) basic livery and TVS tail registration N277EA
Travel Services using a Boeing 737-800 with Swift Air tail registration N917XA
TUI using a Jettime Boeing 737-800 registration OY-JZK
TUI using a Norwegian Boeing 737-800 registration EI-FHX
TUI using a Sunwing Boeing 737-800 registration C-FFPH
TUI using a Sunwing Boeing 737-800 registration C-GFEH
TUI Air Boeing 737-800 registration C-GNCH Sunwing
TUI Air Boeing 737-800 registration C-GLRN Sunwing
TUI Air Boeing 737-800 registration G-TAWU TUI basic livery/Sunwing titles & tail
TUI Air Boeing 737-800 registration G-TAWL TUI basic livery/Sunwing titles & tail
TUI using a Titan Airways Airbus A320 registration G-POWK
TUI using a Titan Airways Airbus A320 registration G-POWM
TUI using an ASL Airlines Boeing 737-800 registration F-GZTZ

Here is list of special livery aircraft may visit Skiathos (not related with 737Max issue)
Austrian Airlines Airbus A320 registration OE-LBO (another, “new” retro livery of Austrian Airlines) (seen at Skiathos on 01JUN on first Austrian flight of the season)
Austrian Airlines Airbus A320 registration OE-LBL EU flag painted on nose cover
Condor Airbus A320 registration D-AICH is now with retro livery such D-AICA till last year
Condor Airbus A320 registration D-AICA is ex retro livery now mixed Air Transat (tail) colours (seen at Skiathos on 06MAY)
NEOS Boeing 737-800 ex Air Samoa colors registration I-NEOS (seen at Skiathos on first NEOS flight on 27 May 2019)
Sky Express using a WDL BAE 146 registration D-AWUE since 20APR till 12MAY
Sky Express latest ATR72-500 BRA (Braathens Regional), full colours, registration SE-MDI enter fleet 01JUN2019
Transavia Sunweb PH-HSJ Sunweb 2019 (seen at Skiathos on first Transavia flight)
Transavia B737-800 non standard livery, registration PH-GUV
Transavua B737-800 Peter Pan livery, registration PH-HSI
Transavia B737-800 Sun Country titles, registration PH-HXA
Thomas Cook A321 G-TCDV “Gold” Anniversary livery
TUI Boeing 737-800 mixed Sunwing livery registration G-TAWL

Skiathos routes, flight numbers decode for summer 2019.

The column for 2018 is filled with all known flights numbers flew already to Skiathos. Expect to add continuously information till end of June 2019, since many flights did not start yet. Till that time there are values marked with (*) showing the call signs used in 2018. After the first flight for summer 2019 green columns will filled with the new codes.

Last update 28ΜΑΥ2019